Follow the usual precautions of wearing rubber gloves, and a face mask when handling chemicals. Keep the saucepans, jugs, spoons and any other utensils just for dyeing and do not use them for food preparation. Weigh the indigo, soda ash and Dithionite or Spectralite in labelled jam jars rather than in the bowl of the balance or scales. Make sure your Dithionite is not too old.
