: Collections & Research

2019 is the 150th anniversary of the Periodic Table of Chemical Elements (see UNESCO https://www.iypt2019.org/). The "International Year of the Periodic Table of Chemical Elements (IYPT2019)" is an opportunity to reflect upon many aspects of the periodic table, including the social and economic impacts of chemical elements.

Sulphur is the fifth most common element (by mass) on Earth and one of the most widely used chemical substances. But sulphur is common beyond Earth: the innermost of the four Galilean moons of the planet Jupiter, Io, has more than 400 active volcanoes which deposit lava so rich in sulphur that its surface is actually yellow.

Alchemy

The sulphate salts of iron, copper and aluminium were referred to as “vitriols”, which occurred in lists of minerals compiled by the Sumerians 4,000 years ago. Sulfuric acid was known as “oil of vitriol”, a term coined by the 8th-century Arabian alchemist Jabir ibn Hayyan. Burning sulphur used to be referred to as “brimstone”, giving rise to the biblical notion that hell apparently smelled of sulphur.

Mineralogy

Sulphur rarely occurs in its pure form but usually as sulphide and sulphate minerals. Elemental sulphur can be found near hot springs, hydrothermal vents and in volcanic regions where it may be mined, but the major industrial source of sulphur is the iron sulphide mineral pyrite. Other important sulphur minerals include cinnabar (mercury sulphide), galena (lead sulphide), sphalerite (zinc sulphide), stibnite (antimony sulphide), gypsum (calcium sulphate), alunite (potassium aluminium sulphate), and barite (barium sulphate). Accordingly, the Mindat (a wonderful database for all things mineral) entry for sulphur is rather extensive: https://www.mindat.org/min-3826.html.

Chemistry

Sulphur is the basic constituent of sulfuric acid, referred as universal chemical, ‘King of Chemicals’ due to the numerous applications as a raw material or processing agent. Sulfuric acid is the most commonly used chemical in the world and used in almost all industries; its multiple industrial uses include the refining of crude oil and as an electrolyte in lead acid batteries. World production of sulfuric acid stands at more than 230 million tonnes per year.

Warfare

Gunpowder, a mixture of sulphur, charcoal and potassium nitrate invented in 9^th century China, is the earliest known explosive. Chinese military engineers realised the obvious potential of gunpowder and by 904 CE were hurling lumps of burning gunpowder with catapults during a siege. In chemical warfare, 2,400 years ago, the Spartans used sulphur fumes against enemy soldiers. Sulphur is an important component of mustard gas, used since WWI as an incapacitating agent.

Pharmacy

Sulphur-based compounds have a huge range of therapeutic applications, such as antimicrobial, anti-inflammatory, antiviral, antidiabetic, antimalarial, anticancer and other medicinal agents. Many drugs contain sulphur; early examples include antibacterial sulphonamides, known as “sulfa drugs”. Sulphur is a part of many antibiotics, including the penicillins, cephalosporins and monolactams.

Biology

Sulphur is an essential element for life. Some amino acids (cysteine and methionine; amino acids are the structural components of proteins) and vitamins (biotin and thiamine) are organosulfur compounds. Disulphides (sulphur–sulphur bonds) confer mechanical strength and insolubility of the protein keratin (found in skin, hair, and feathers). Many sulphur compounds have a strong smell: the scent of grapefruit and garlic are due to organosulfur compounds. The gas hydrogen sulphide gives the characteristic odour to rotting eggs.

Farming

Sulphur is one of the essential nutrients for crop growth. Sulphur is important to help with nutrient uptake, chlorophyll production and seed development. Hence, one of the greatest commercial uses of sulfuric acid is for fertilizers. About 60% of pyrite mined for sulphur is used for fertilizer manufacture – you could say that the mineral pyrite literally feeds the world.

Environment

Use of sulphur is not without problems: burning sulphur-containing coal and oil generates sulphur dioxide, which reacts with water in the atmosphere to form sulfuric acid, one of the main causes of acid rain, which acidifies lakes and soil, and causes weathering to buildings and structures. Acid mine drainage, a consequence of pyrite oxidation during mining operations, is a real and large environmental problem, killing much life in many rivers across the world. Recently, the use of a calcareous mudstone rock containing a high proportion of pyrite as backfill for housing estates in the area around Dublin caused damage to many houses when the pyrite oxidised; the case was eventually resolved with the “Pyrite Resolution Act 2013” allocating compensation to house owners.

Conservation of museum specimens

Because iron sulphides are highly reactive minerals, their conservation in museum collections poses significant challenges. Because we care for our collections, which involves constantly improving conservation practice, we are always researching novel ways of protecting vulnerable minerals. Our current project, jointly with University of Oxford, is undertaken by our doctoral research student Kathryn Royce https://www.geog.ox.ac.uk/graduate/research/kroyce.html.

Come and see us!

If all this has wetted your appetite for chemistry and minerals, come and see the sulphur and pyrite specimens we display at National Museum Cardiff https://museum.wales/cardiff/, or learn about mining and related industries at Big Pit National Coal Museum https://museum.wales/bigpit/ and National Slate Museum https://museum.wales/slate/.

The National Roman Legion Museum in Caerleon will be open from 24th October 2019 – just in time for the half term holidays!

Getting a new roof is never straightforward, especially for a museum with 1,700 objects on display.

We’ve been closed to the public for a year while the gallery was turned into a building site. We now have a brand new roof, new lights, display panels and a lick of paint; everything’s looking shiny and new! Now all we need is visitors to come and enjoy it.

What happened to the artefacts?

While the builders have been working, the artefacts have been looked after at National Museum Cardiff.

For some of these objects, it’s the first time they have been out of the display cases for 30 years, so now is the ideal opportunity to have them checked and treated by the archaeology conservator, and photographed so that they can go into Collections Online – our online catalogue where you will be able to see images and details of all of the objects that are on display.

Museum photographer Robin Maggs photographing a Roman glass bottle

Some objects are too big to move and had to stay where they are, so they have been boxed in and kept safe throughout the building work.

Gallery during the works

Before the objects were returned, those display cases needed a thoroughly good clean, and there’s only one way to really clean the inside of a case – that is to get inside it!

Museum Assistant Paul cleaning inside a display case

Ever looked closely at how objects in museums have been held up, or positioned on display? Hopefully not! It’s thanks to the curators that you don’t notice these things, so that your attention is drawn to the objects themselves. It can be painstaking work, but it’s worth it in the end.

Curator Jody Deacon placing the skeleton back in his coffin

Curator Alastair Willis re-displaying Roman coins

What next?

Now the objects are back in their display cases, back home where they belong, ready for you to come and enjoy them. We’re really looking forward to sharing our wonderful collections with you.

We also have all manner of activities, crafts and storytelling going on in half term, not to mention, of course, your opportunity to meet a Roman soldier.

Continuing the international year of the periodic table of chemical elements, for August we have selected arsenic.

Preserving the Beasts – The Use of Arsenic in Taxidermy

The taxidermy animals are a much loved and visited part of displays at the Museum. The word ‘taxidermy’ itself comes from taxis ‘arrangement’ and derma ‘skin’, and is the art of mounting or replicating animal specimens in a lifelike way for display or study.

The development of the methods used to create taxidermy date back over three hundred years. Initially these didn’t preserve the prepared specimens very well, and the taxidermy mounts were usually lost to decay and insects.

Various attempts were made to improve preservation methods and these used a wide variety of materials such as herbs, spices and various salts, applied as powders, pastes and solutions. However these methods were not generally successful.

During the 1700s’ some taxidermists started to use more poisonous chemicals such as arsenic minerals or mercuric chloride to help preserve their taxidermy. Due to their toxic nature these treatments helped prevent decay and insect damage, greatly improving the long term preservation of the taxidermy.

The success of these chemicals soon led to the development of the ‘arsenical soap’ treatment to aid preservation of the animal skin. The soap was a mix of camphor, powdered arsenic, salt of tartar, bar soap and powder lime – I wouldn’t use this for washing yourself though! The soap enable the arsenic to be applied in a practical way by rubbing into the underside of a cleaned and prepared skin. This method proved very popular and remained in use up until as recently as the 1970s’.

The use of arsenic as part of the preservation treatment has since stopped. This is mainly because of its toxic nature and the associated risks to human health, but it is also due to better practices in the taxidermy techniques used today.

Inorganic arsenic (As) is a grey-appearing chemical element with the atomic number 33 on the atomic table. It is a metalloid meaning that it has both metallic and non-metallic properties. Its properties have long been used by humankind in a variety of ways such as a medicinal agent, a pigment and as a pesticide. Arsenic and its compounds are especially potent poisons and hence harmful to the environment and considered carcinogenic. Its toxicity to living things is due to the way it disrupts the function of enzymes involved in the energy cycle of living cells.

Does this then mean that our older taxidermy specimens containing arsenic are harmful in some way? Potentially yes if a specimen is damaged and the underside of the skin is exposed, but an intact specimen poses little risk provided sensible precautions are taken such as appropriate protective equipment when moving or conserving an affected specimens.

Besides, today most of the specimens we have on open display are preserved without the use of toxic chemicals, but such specimens are at greater risk of damage by insects. We thus monitor our collections to look out for the signs of insect infestation, and treat with safe and sustainable methods such as freezing if they occur.

But a good reason not to touch the specimens…..

Saturday 6th October 2019 8.30am

I took my breakfast cereal into the living room and looked out at the sky for any hint of what the weather might do. It had been raining and very windy for days, the remnants of hurricane ‘Lorenzo’ had been battering Wales all week. The sky was cloudy, a hint of drizzle against the glass and the weeping willow in our front garden was doing a samba.

Today I had more than a passing interest in the forecast as I had a boat trip planned for later that morning, in a very special boat.

The Ferryside Lifeboat to be precise, a 6.4 metre long RIB, the ‘Freemason’ which cost about £90,000, £50,000 of which was donated by the Freemasons, hence the name.

The crew had bought all new safety suits and gear and had offered the museum one of their old suits for our maritime collection. We jumped at the chance to acquire this very important piece of our seagoing history. One of the crew members is Mark Lucas who happens to be Curator of Wool at the National Woollen Museum in Drefach Velindre, Carmarthenshire and it was at his suggestion that the suit be donated to us. The lifeboat crew were running sea trials that morning and had asked me to go along to experience the conditions for myself and collect the gear.

We have three lifeboats in the National Collection, two of these have wooden hulls and in 2011 we collected a RIB (rigid hull inflatable boat) from Atlantic College in St Donats, where the original RIB design was created and patented by the college. So the fact that the suit was from a RIB crew made it even more special.

Eleven o’clock found us at the Lifeboat Station on the Towy Estuary in Ferryside. The Ferryside Lifeboat is an independent station, as are many around our coastline, and not funded by the RNLI. Just like the RNLI they are run by volunteers and rely on donations and grants.

The crew were gathering and getting changed into their ‘new’ suits and they had one for me to wear too. Now, getting into a ‘dry suit’ is no easy task, especially for a novice like me. To say it was a struggle is an understatement, and after ten minutes of performing like a contortionist and the ensemble heckling me that

‘people are drowning come on!’

It was then they decided that I needed a bigger suit. Hmm…

The weather by this time wasn’t too bad, a slight wind and light rain and the estuary looked fairly calm, this was indicated by the fact that the new ferry was sailing between Llansteffan and Ferryside.

‘That looks OK, not too rough’ I thought to myself, and it was OK in the estuary…

The giant Talus tractor pushed the lifeboat the ‘Freemason’ down the slipway and into the water. I was already installed by this point having been pushed unceremoniously over the rubber tube by the crew as I struggled to climb aboard in an extra 20 kilos of suit and gear. The rest of the crew climbed aboard (easily) and we set off.

As I thought the estuary was fairly quiet, but the coxswain pointed out to sea where I could see large white breakers rolling in over a sandbar which runs roughly from Laugharne to St Ishmaels.

‘That’s where we are going, it’s a bit lively out there, all good fun though’.

It was very lively. The crew put the boat through its paces doing figure eights and three-sixty manoeuvres, all at high speed whilst I hung on tightly and braced myself against the G-force of the turns. The boat will do 30 knots flat out, about 26 miles an hour, which doesn’t seem fast in a car on the road but in a boat is a different matter.

I kept thinking how brave these guys are to come out in all weathers and try and rescue people. The sea we were in wasn’t that rough and it was broad daylight. I couldn’t imagine what it would be like in a gale and in the dark.

Eventually we headed in and back to the comparatively flat calm of the river Towy. My trip was over and what an experience!

We headed for the Lifeboat Station and the crew presented me with a dry suit, life jacket, radio and GPS locator which are now part of the National Collection and on display at the National Waterfront Museum in Swansea.

Continuing the international year of the periodic table of chemical elements, for September we have chosen carbon, the element which – in coal - has arguably had the most influence on the shaping of the built landscape and culture in Wales.

The Welsh Coalfields

For around 150 years the coal industry has dominated the industrial, political and social history of Wales. Between 1801 and 1911 the population of Wales quadrupled from 587,000 to 2,400,000. This was almost entirely due to the effects of coal mining: either directly through the creation of colliery jobs or through industries reliant on coal as a fuel (eg. steel-making).

There are two major coalfields in Wales, one in the north-east of the country and one in the south.  North Wales produced mostly high volatile, medium to strong caking coal, and the coalfield has a long history of production. By 1913, it was producing around 3,000,000 tons per annum but went into a slow decline afterwards. The last colliery in the area, Point of Ayr, closed in 1996.

The south Wales coalfield is more extensive than that of north Wales.  It forms an elongated syncline basin extending from Pontypool in the east to Ammanford in the west, with a detached portion in Pembrokeshire. The total area covers some 1,000 square miles.

The south Wales coalfield is famous for its variety of coal types, ranging from gas and coking bituminous coals, steam coals, dry steam coals and anthracite. They had a wide range of uses: domestic, steam raising, gas and coke production and the smelting of copper, iron and steel.

Loose jointed and friable roof conditions were more commonplace in south Wales than other UK coalfields which resulted in numerous accidents from falls of roof and sides. The deeper seams are also very ‘fiery’ leading to numerous disasters. Between 1850 and 1920, one third of all mining deaths in the UK occurred in Wales. Between 1890 and 1913 alone there were 27 major UK mining disasters, thirteen of which occurred in south Wales including the 1913 explosion at the Universal Colliery, Senghenydd where 439 men died – the largest loss of life in a UK mining disaster.  North Wales was largely free of major disasters but, in 1934, an explosion at Gresford Colliery killed two hundred and sixty-six men, the third worst disaster in Welsh mining history.

South Wales steam and anthracite coal differ from other coal seams due to the presence of numerous partings (‘slips’) which lie at an angle of about 45 degrees between floor and roof.  This made the coal relatively easy to work as the coal fell in large blocks.  However this large coal was coated with fine dust which was the prime cause of pneumoconiosis, a disease which was more prevalent in south Wales than all other UK coalfields. In 1962, 40.7% of all south Wales miners were suffering from the disease.

A close relationship grew up between coal mining and the local community.  Villages were virtually single occupation communities. In Glamorgan and Monmouthshire half of all adult male workers were directly involved in the coal industry, while in places such as the Rhondda and Maesteg, the proportion could be as high as 75%.

Because of the peculiar geology and geography, south Wales was slow to unionise. However, following the humiliating defeat after the 1898 coal strike, there arose a need for unity and in 1914 the South Wales Federation became the largest single trade union with almost 200,000 members.

From the early 1920s until WW2, the Welsh coalfields suffered a prolonged industrial recession due to the changeover to oil by shipping and the development of foreign coalfields. The numbers of miners fell from 270,000 to 130,000. The industry was nationalised following the war and experienced tremendous changes with the introduction of new techniques and equipment. There was now a greater emphasis on safety, but the coalfields were still dangerous places. In 1960, 45 men died in Six Bells Colliery, 31 died in Cambrian Colliery in 1965 and, perhaps most tragically of all, 144 people died when a tip collapsed on Aberfan, including 116 children.

By the 1980s the threat of mass pit closures arose. In March 1984 the last major strike began and continued for twelve months. Following the defeat of the National Union of Mineworkers, mines began to close on a regular basis. By the mid-1990s, there were more Welsh mining museums than working deep mines.  The last deep mine, Tower Colliery, closed in January 2008. One of the most important influences on Welsh social, industrial and political life has now vanished.