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Gum Ammoniac is a natural tree sap. It is commonly used as an adhesive for gilding in calligraphy, as it allows for fine detailing and precise strokes.

To make your own gilding size, cover a few lumps of gum in water and leave to soak overnight. Large pieces can be broken easily, so as to be fully covered by the water. In the morning, stir the resultant milky liquid, and strain. As the size hardens quickly, it is important to wash any nibs or brushes thoroughly and frequently to preserve their condition.

PBr7

Raw Umber Greenish is a natural earth pigment composed of iron oxide, manganese, and aluminium silicate. It has its roots in the Umbria region of Italy, and was historically a popular colour for underpaintings, as it dries very quickly. It is semi-opaque, very lightfast, and stable in all media but may be difficult to disperse in acrylic. It requires a large amount of liquid when mixed with oil.

Toxicity: B

PR83

Alizarin Crimson is a synthetic organic pigment that became available in 1868. It requires a wetting agent to disperse, and in oil it also absorbs a lot of liquid and dries very slowly to form a hard, brittle paint film. It is chemically identical to madder-root pigments and should be protected against UV light where possible as it can fade when applied onto a white ground, although it is less fugitive than its natural counterpart. Alizarin Crimson is a very transparent pigment, with a high tinting strength and slightly blue undertone.  

Toxicity: A/B

Larger quantities are available by request.