9/10/2023 0 Comments Black light images![]() ![]() The Artifact Lab Gallery will be open to the public during all Museum open hours. Here is a picture of the objects before treatment: Moreover, glass can take a wide range of different shapes. This composition and the percentages of each substance change according to times and places. – A fourth material, metal oxides, can be added to obtain a specific color (manganese for purple, gold for red, silver for yellow…). – A stabilizer, inserted inside the chemical structure of the glass to strengthen it usually lime. – A flux, lowering the melting point of the glass mixture, the melting point being the temperature at which the glass mixture becomes a liquid (from 1600-1713 Celsius for raw silica alone to 800 Celsius for silica + a flux) this material is an alkali or soda. – A former, being the main component: silica, usually found in sand Their date is unknown.įirst of all, what is glass made of? Generally three materials are mixed together: ![]() They are two glass vessels from Cyprus, which were discovered in the archaeological site of Kourion. () Recently, two new objects were brought to lab. While we primarily work on Egyptian materials in the Artifact Lab, we occasionally work on objects from other cultures as well. Posted in examination, imaging, Objects In the Artifact Lab | Tagged cartonnage, Egyptian blue, IR photography, madder, multispectral imaging, SPEX mini crimescope, UV fluorescence, UV light, visible induced IR luminescence, Wilfred, Wilfreda | Leave a reply A new material in the Lab * Special thanks to conservation intern Yan Ling and Conservator Tessa de Alarcon for their help with capturing and processing these images. There are other ways we could try to confirm this, but this was an exciting, and unexpected observation! Madder has been identified as being used in ancient Egypt to create pink pigments for painting, and is known for having a characteristic pinkish-orange UV fluorescence, which is how I would characterize what we’re seeing in the above image. I had never seen this before and wasn’t exactly sure what this meant, but after looking into it a bit, I believe that this fluorescence indicates that the pink areas were painted with madder, a dyestuff obtained from the roots of the madder plant. In this image, the areas that stand out the most are the areas fluorescing a bright orange-pink color, which appear pink in visible light. Captured with a Nikon D5200 modified full spectrum camera with B+W UV-IR-cut filter, using the Mini Crimescope 300-400nm filter. ![]()
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