We had a few boxes of lab coats recently donated, and I was thinking of tie-dyeing some for fun. Instead of getting a commercial kit, I wanted to use substances we already had in stock. I have plenty of sodium carbonate and off the top of my head Congo Red. There is a huge selection of other pigments and dyes that I have never really used. I am fairly sure we have nearly everything on this list: http://en.wikipedia.org/wiki/List_of_dyes Which of these will work with cellulose? I am assuming I need to find dyes with chlorine in their structure, like crystal violet or methylene blue. Is this a gross over-simplification?