Marigold - This dyestuff consists of dried and ground flower heads of the Tagetes species. It yields rich vibrant yellows, green-yellows and oranges with 20 -30% dried marigold to WOF. Marigold has a moderate light and washfastness.
Mordanting: Use alum mordant at 15% WOF for protein fibres. For cellulose, first mordant with tannin at 8% WOF, then either 1) use alum at 15% with soda ash at 2% or 2) use aluminum acetate at 8%.
Dyeing: add the dried flowers to the dye pot, cover with water and simmer for half and hour to extract the colour. Strain the dye liquid and add to dye pot. Add fibres and simmer until the desired shade is achieved. With the addition of iron at 2% WOF warm olives can be made.