Whilst trying (not very successfully) to find a “cure” for fat burn (Figure 1), I made an unwelcome discovery: sometimes the shrinkage temperature of deteriorated skin is actually lower than room temperature. This means that the skin will irreversibly shrink as soon as any water-based treatments are applied.
Figure 1. Fat burn can cause skin to rip and specimens fall apart
Shrinkage temperature (Ts) is commonly used in leather conservation to determine the level of deterioration, and the effectiveness of treatments. Ts is the temperature at which 2 corian fibres immersed in water show simultaneous and continuous shrinkage activity. It shows the level of deterioration because it indicates destabilisation of collagen fibres. Ts of fresh skin is 65oC and in deteriorated leather this can be reduced to 30oC (Florian, 2006). Ts is measured by immersing samples of leather (or skin) in water and gradually increasing temperature until shrinkage activity is observed under a microscope (Larsen et al. 1996; Vest & Larsen, 1999). Continue reading →
Written by Lucie Mascord, NatSCA committee conservation representative.
During the week of the 18th January 2021 NatSCA will be hosting their first ever Twitter conference all on the subject of conservation.
Following on from the success of our inaugural conservation conference “Caring for Natural Science Collections” held at Oxford University Museum of Natural History back in October 2018, the NatSCA conservation working group had hopes of another conference this year. However, it was not to be, so we are changing the format and coming to you in 2021!
Given how strange this year has been we are keeping it simple. Just follow us on the week of 18th January (programme with exact dates and times to follow) on the hashtag #NatSCAConservation and we will bring the unique world of natural science conservation to you for free! Join us for this great opportunity to explore conservation work relating to the range of natural materials including bone, taxidermy, fluid preserved collections, geology, botany and entomology.
I received a mounted taxidermy otter in still life pose without a base from the Tenby museum, Wales where it had been in long term storage wrapped in Tyvek. On initial examination it showed some skin shrinkage and was covered in a thick layer of dirt, grease and dust.
Tahemaa has been a resident of the Bournemouth Natural Science Society since 1922, when she was donated from the Salisbury museum (fig. 1). New research indicates that she arrived in the UK in 1823 from the ancient city of Thebes, now known as Luxor, on the river Nile. Her coffin is dated from 700 BC making her approximately 2700 years old. We know from the hieroglyphics on the side of her coffin that she was the daughter of a Hor a high priest of Montu, the Flacon-God of War. Other than this we know very little about her and her life in Egypt.
Figure 1. Tahemaa the Mummy at the Bournemouth Natural Science Society.
Tahemaa has been at the Society for nearly 100 years but she has spent most of this time locked away from public view. In 1993, the Society decided to put her on permanent display in the Egyptology exhibition. Since then she has been seen by thousands of admirers, however due to her age and fragile condition, she is in need of urgent conservation treatment. Hundreds of years in an unstable environment have caused significant damage to the coffin. The fluctuations have caused the wood, plaster layers and paint to crack and flake. The layers of the coffin have even separated in some areas, lifting away from the wooden frame (fig 2). Many years without a display case has also resulted in a thick layer of dark, engrained dirt concealing the original colours of her decorative paintwork (fig 3).
Figure 2. Layers of the coffin structure peeling away.
Figure 3. Original colours are darkened with the build-up of surface dirt.
In March of this year I helped out on the Conservation stand at an evening event as part of my role as Volunteer Intern at National Museum Cardiff. It was a fun event, with a turnout of 852 curious visitors. Art conservators and natural history conservators collaborated to show how natural history specimens could inform and create imagery and art.
Photo of me (left) talking to guests at the National Museum Cardiff ‘After Dark’ event alongside Vertebrate Curator Jennifer Gallichan (centre) and local artist Nichola Hope (right) drawing. Photo courtesy of Caitlin Jenkins.
Throughout the event both children and adults came up and asked a lot of questions about the objects, and I noticed some reoccurring queries, especially around the ethics of taxidermy. I have attempted to answer some of these here, so that if anyone else reading this faces the same conundrums, this article will set their mind at ease, or enable them to answer the questions confidently.
Is it ‘ethical’?
‘Ethical’ is a subjective term, therefore what is considered ethical varies between taxidermists. Whether the preservation of animal remains, without the inherently unobtainable consent of the animal, is in itself ethical is up to each individual to decide. ‘Ethical-taxidermy’ has become a more frequently used term generally referring to the animal not being killed specifically for the purpose of becoming a mount. However, this refers to a wide range of sources and can range from accidental deaths such as finding an animal dead or road kill, right through to by-products of culling, pet food supply animals and pest control salvages.