I did the math for dye amounts ( WOF x DOS / % Dye stock ) I came up with 75 mls of dye. I decided to use no more than that for this experiment. I measured the dye with a syringe and drizzled it over the wet fibre. I turned the burners on to low at this time, so that the water would start heating.
|Exhausted acid dye bath is clear!|
I'd watched a couple of you tube videos about this technique and there were a number of them which showed brightly coloured water, with the commentary " Look, the dye has exhausted and we can remove it now". This is what an exhausted acid dye bath looks like. The water should be clear and not coloured! If you use too much dye, the water won't exhaust and it is a waste of dye.
It is important to let the fibres cool slowly, to avoid felting from temperature shock. I let it cool in the pot. The nice thing about a rectangular pan with little water, is that the whole lot cools down in only a couple of hours. After a quick rinse to make sure there was no residual dye, and a spin in a dye dedicated salad spinner, I laid the fibre outside on a drying rack, covered with screening. With the breezy days we've been having, it dried in no time.