Demonstrate the fascinating science of photochromic materials with this UV Fluid, ideal for engaging practical lessons in primary, secondary and college settings. Teachers and students can observe real-time colour changes, making abstract concepts tangible and memorable.

• Contains non-toxic liquid paraffin with a UV-sensitive photochromic dye
• Appears clear indoors; turns coloured when exposed to UV or sunlight
• Reversible colour change, returning to clear in about 60 seconds
• Supplied in a 50ml jar
• Suitable for demonstrations and experiments on smart materials and light reactions