To be used for mordanting in natural dyeing.
TIN (stannous chloride) blooms or brightens colors, especially reds, oranges and yellows. Almost always used with cream of tartar 1/2 ounce tin and 1-2 ounces of cream of tartar for a pound of wool. Simmer for an hour and rinse in soapy water before dyeing. Tin is a good additive mordant. Store wool wet or dry. Too much tin makes wool brittle.
For recipes, we recommend two books, either the Ashford Book of Dyeing or Colours From Nature by Jenny Dean.