Thorn crust ink, also thorn ink mentioned, was one of the most frequently used kinds of ink of the Middle Ages.
It unites the light fastness and durability of the soot ink with the water firmness of the Eisengallustinte, without possessing their disadvantages. The ink has a red-brownish colouring.
The production of thorn crust ink describes the monk Theophilus around 1100 in one of its books as follows: One cuts branches of thorn of Schlehen (notes: prunus spinosa) in April or May briefly before deflecting and these some days let lie. Then the crust is knocked off and set with water. This beginning stops likewise some days. If the water is red-brown discoloured, the mixture is boiled up and shifted with the crust. This procedure is repeated until the crust is solved completely leached out, thus from all colorgiving components. The developed in such a way is in-cooked in the end with wine and dried in a at the sun. To the letter one loosens the pulvrige substance in warm wine.
This powdery concentrate was almost for an unlimited period durable.
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