Saturday, May 29, 2010
Violets in the lawn
While double pinks require two different strengths of an alum mordant, Tonne de noir is achieved with a different mordant. Iron acetate is made by dissolving rusty iron pieces in vinegar, acetic acid. This iron mordant can be thickened with gum and printed onto the fabric. Mordants are often colorless and a 'sighting' (fireplace ash) is added to help the block printer align the next impression or the application of a second strength of the iron mordant.
The fabric is then processed in a madder dye bath producing a printed fabric in a weak black, a purple or a lilac.