A substance–such as alum, chromium, copper, IRON or tin–used to fix dye to fabric. Most natural dyes have no inherent ability to attach themselves to fibres; instead, a fabric must first be combined with a mordant (in most cases through boiling) that carries metal ions, to which the dye fixes itself. The earliest, least toxic and the mordant most often used in block printing is alum See aluminium.

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