Another of the same [to make horn soft]

Juice of the herb called in Latin marubium album, and celery juice, also juice from Millefolii herb, also radish juice, and celandine juice, also strong vinegar; mix it all together and lay the horn therein, and set it for seven days, well covered, under warm horse manure. Work with it then as is mentioned above.

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