: General

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 shrine of St David in St David’s Cathedral, Pembrokeshire, was an extremely important pilgrimage site in the Middle Ages. Two pilgrimages there were worth one to Rome, and thousands of people would have visited before the shrine was destroyed at the Reformation.

Inspired by the ‘Beneath our Feet’ project run by Narberth Museum and Tenby Museum and Art Gallery, which is looking at the theme of pilgrimage in Pembrokeshire, Saving Treasures; Telling Stories decided to find out more. What did those long-ago travellers leave behind them?

Pilgrim Objects

Two kinds of objects were commonly associated with pilgrims in the Middle Ages: ampullae, and badges.

Ampullae were little lead scallop-shaped flasks containing holy water that were pinned to clothing or hung around the neck in the belief that they offered spiritual protection. You might expect to find large numbers of them in Pembrokeshire, with its important holy shrine.

It seemed a fair bet that local metal detectorists had found plenty over the years.

But, a search on the Portable Antiquities Scheme (PAS) database, where over a million detectorist finds are recorded, revealed some surprises.

In fact only SIX examples from Pembrokeshire have been recorded with PAS – a surprisingly small amount! Surely there should be many more?

To compare, we looked at the records for Kent, home of medieval England’s most important pilgrim destination – the shrine of St Thomas Becket at Canterbury Cathedral. Even here, only 50 pilgrim ampullae have been recorded with PAS, not such a huge number considering the many thousands of people who travelled there.

Contrast this with Lincolnshire, where 232 ampullae have been recorded, the biggest number of any county in Wales and England. Lincoln Cathedral boasted two important shrines (both to saints called Hugh), but this does not explain such a big difference in numbers.

What’s going on?

Confused, we turned to pilgrim badges. These were usually made of lead or pewter and depicted saints, letters and religious scenes and symbols. They were bought at shrines as souvenirs and pinned to clothing.

Surely lots of these cheap objects would have been lost by the visitors to St David’s?

But a search on the PAS database turned up NO examples from Pembrokeshire at all!

Even in St Thomas Becket’s Kent, no more than 11 badges have been recorded with PAS. Greater London has by far the highest number, at 119.

Then we saw that five pilgrim badges had been reported from Swansea, which seemed unusual as there was no important medieval shrine in the town. One of them was a badge of none other than Thomas Becket himself. How had that got there?

It turned out that each one of these badges had been discovered, not in the city itself, but under the sands of Swansea Bay.

Intrigued, we chose a random sample of the London badges and discovered that they had all been found in the River Thames.

We checked the find spots of the ampullae, and sure enough, two had been found on Tenby beach and two others in the coastal village of Manorbier. There was a definite watery theme!

Giving thanks?

In an age when travel was difficult and dangerous, ships were the fastest method of transport, though not necessarily safe.

So it makes sense that pilgrims going on long journeys would travel at least part of the way by water, and would be relieved and thankful when they reached the shore safe and sound. The evidence of all these badges and ampullae dug from the sands and fished from the Thames suggests that returning pilgrims threw them into the water, perhaps as a way of giving thanks for a safe return.

Rediscover Roman treasure found in Caerleon in 1926!

Use the App to explore the Amphitheatre & Barracks at Caerleon. Follow clues and meet historical characters to help you discover the Museum’s treasures - where they were once found. If you find them all you will unlock a virtual National Roman Legion Museum. This App is a partnership project between Amgueddfa Cymru - National Museum Wales and Cadw. It links museum treasures to the places where they were once found at the historic sites maintained by Cadw in Caerleon.

How to play:

• Use your device & the treasure map to find the six hidden clues in the Amphitheatre and barracks.

• You must walk to each of the six picture clues in the grid.

• When you are near the treasure a coin will appear on your device. Each coin reveals a treasure & activity.

• Find them all to unlock a virtual National Roman Legion Museum!

FAQ

• The app requires Android 4.3 or iOS 9.1 or later. Please note the app is not compatible with some budget smartphones. 
• You will need a data connection during the experience.
• If you are having a problem downloading the app make sure you have a good internet connection and that you have enough storage space on your phone.

Cost: Free 

Suitability: for Families

Duration: 30-50mins

Download for iPhone

Download for Android 

Hi all, I’m Pip Diment from the Exhibitions team, and I'm one of a group of staff volunteering to care for the six live snakes we are housing as part of the 'Snakes’ exhibition at National Museum Cardiff.

Our exhibition is now open and runs to 15 September 2019. I was part of the team who cared for the snakes for the second two weeks of the exhibition run. We were trained by Guy Tansley from Bugsnstuff and he showed a group of us volunteers how to check on the snakes safely and provide basic care.

Guy Tansley from Bugsnstuff.

We are not required to feed the snakes – we have Dr Rhys Jones generously helping us with that. Our tasks are to change the water daily, remove any poo, ureic acid crystals (wee!) and calcium plugs, also to remove any shed skin and to check the snakes are not too cold or hot and that they are ok. These checks are all done daily by a team of two or three volunteers.

Some of our volunteer snake care team.

On my first day volunteering I worked with Melissa Hinkin (from Artes Mundi, who is a snake enthusiast) and Vic le Poidevin (from our Events team). There was great excitement the first morning as Prestwick, the Jungle Carpet Python had shed her skin and had an enormous poo!  She’s a fairly large snake so it shouldn’t have been a surprise, but it was huge! Like a large dogs! The skin itself came off in two parts and is now being used as part of the handling collections (not too much handling as it is fragile!). Underneath all that shed skin Prestwick has now emerged even more beautiful with her skin a stunning irridescent effect. And this was still only day one.

On day two I worked with Christian Baars (from Conservation) and Robin Maggs (from Photography). Once again, much excitement as Keith, the Royal Python, shed his skin overnight. Much smaller poo – smaller snake, so made sense! He also looked much more beautiful after shedding his skin.

Days three and four were not as eventful – only water changing and general checks required. Everyone seems very healthy and happy, and we are following their care instructions meticulously to ensure they stay that way. 

I admit I have an unhealthy interest in snake poo – and for the end of my first week we’ve had another poo! This time, again, from Keith. I am not the only one now excited by snake poos – see Robin and Christian admiring Keith’s offering (look closely it has substrate on it which makes it looks like it has eyes!)

I’m so glad I agreed to volunteer. I’ve held snakes before, but never spent so much time with them. I love that they all have great names and their own characters:

Prestwick, Jungle Carpet Python (Morelia spilota cheynei), female, approx. 10ft

Keith, Royal python (Python regius), male, approx. 3.5ft.

Mela, Boa constrictor (Boa constrictor), male, approx. 6ft

Kibblesworth, Hog nose (Heterodon nasicus), female, approx. 2ft

Carlos, Milk snake (Lampropeltis triangulum campbelli), male, approx. 3.5ft

Seren, Corn snake (Pantherophis guttatus), female, approx. 4.5ft

Thanks for reading. You can read some of our other snake blogs here, here and here.

The exhibition runs till 15 September 2019, entry charges do apply, and all your contributions go towards bringing you even bigger and better exhibitions in the future.

Please note that there is no live handling of the snakes within the exhibition. In August we’ll be having snake handling sessions for the public – see here for details of booking.

Also, make sure you come and visit us this saturday (10 August) for our Venom Open Day!

One of the best reasons for housing heritage collections inside buildings is that the building keeps the weather out. Paintings, fossils, books and skeletons are best kept dry, and walls and roofs protect our collections (as well as staff and visitors) from the elements.

In addition, many of the objects in our collections also need specific temperature and humidity ranges to prevent them from suffering damage. Too high a humidity can cause swelling of wood, for example, initiating cracks in objects, or, if humidity gets even higher, mould growth. Therefore, National Museum Cardiff has a complicated air conditioning system. This system is more than 40 years old and has been maintenance-intensive and inefficient for some time.

We are happy to report that, after several years of planning, we have just completed the installation of new chillers and humidifiers at National Museum Cardiff. The purpose of chillers in the museum is to provide cold water – for lowering the temperature of galleries and stores in the summer, and for dehumidifying stores and galleries if there is too much moisture in the air. Humidifiers achieve the opposite effect: they increase humidity in stores and galleries if it is too low. Low humidity is usually a problem during the winter months – you may have experienced your skin drying out at home when you have the heating on in winter. To prevent our collections drying out we cannot apply skin cream; instead, we maintain a minimum level of humidity in stores and galleries.

The chillers and humidifiers have been commissioned now, and are working well. They have already proved that the control of our indoor environments is better than it was before. A very positive side effect of the new technologies is that they are much more efficient than the old equipment. In fact, they are so efficient that we are anticipating to shave almost 50% off our annual electricity bill for National Museum Cardiff, saving the planet more than 500 tonnes of carbon dioxide every year. That is the equivalent of taking 100 cars off the road, or the average energy a family home uses in 38 years.

By investing in such new technologies, Amgueddfa Cymru – National Museum Wales continues to ensure the safe storage and display of the nation’s heritage collections, whilst at the same time making a massive contribution towards the National Assembly’s commitment to reduce carbon emissions by 80% by 2050 (Environment Wales Act 2016).

Find out more about Care of Collections at Amgueddfa Cymru - National Museum Wales here and follow us on Twitter. Follow the progress of the maintenance works during the coming months in 2019 on Twitter using the hashtag #museumcare.