To make horn so soft that it can be worked into forms

Take one pound of ashes used to make glass, a pound of unslaked lime, one mass of water, and let it boil together until two thirds is boiled off. Then stick a feather in and run it between the fingers; if the hairs come away, it is boiled enough. If not, let it boil longer. Let it clear and strain the top portion off. Then take small chips of horn, let it soften therin for two days, then smear your hands with oil and work the horn well between them till it is a paste, then put it into whatever form you wish.

Citation Type  Wood/Bone/Horn Dye Recipe
Citation Year 1532