Each pigment is combined with binder (gum arabic, glycerin and natural honey), then mulled and poured into pans. Each pan must be filled in at least 2 layers and it can take up to one week for each layer to dry.All pans are fitted with a small magnet to prevent them from rolling around in tins. Bubbles may occur as part of the natural paint making process. This does not affect the quality of the watercolour. This item is made of chameleon pigment and gum arabic, distilled water, glycerine, clove oil.