[inofindy]

Maybe I am wrong but most of the commercial dyes you buy are acid dyes. If you try to fix it with vinegar the colour will come back out. Is it a hot or cold dye?

Too long to go into the technicalities of dyeing. But professionaly you add dye to the to make a liquor and all the colour goes on. The main thing is that the garment is totaly immersed. Its the lack of oxygen that does the work. When the fabric reaches a certain temperature it breaks down and the colour enters the fibre. Cotton temperatures are high than synthetics

Hope this helps

Hyaku