Original sentence: Amateurs may wish to experiment with some of the suggestions, but should note that urine (human or animal) is used in many recipes as a mordant.Bibliographic references for Parmelia.Fraser, Jean: Traditional Scottish Dyes, Canongate, 1983, ISBN 0-8624-1108-4.The following are the principal dyestuffs with the colours they produce.Traditional dyes of the Scottish Highlands are the.native vegetable dyes used in Scottish Gaeldom,
Edited sentence: Amateurs may wish to experiment with some of the suggestions, but should beware because urine (human or animal) was used in many cases, and is not considered a pleasant ingredient these days.The following are the principal native vegetable dyes used in Scottish Gaeldom, with the colours they produce