Author Archive: RGC Science Club Amethyst Galaxy Papier Filtre Filter Paper + Orange Dye Filter Paper Felt Tip Caper Borax Snowstorm Ink Spots on Paper Dem Bones, Dem Bones, Dem dry manganese sulphate crystals! Amethyst Benzocaine Crystals You put it on your chips! Copper Sulphate Crystals Velcro by Ben McCallum Manganese Sulphate Crystals Sand from Aberdeen beach Tungsten filament Sodium chloride crystal Salol Crystal with Polarisers Here’s a Clue: 11th November Salol Supernova Pencil Shavings