We had a great time yesterday. Five women came, they were nice to each other, helped each other, learned from each other-- we had a great time. I forgot to take pictures, sorry.
We did have one yarn that looked beautiful in the dye pot but washed out latter, so now we think it was not silk. This is a relatively common problem in dyeing workshops. I won't start speculation about why this happens because it could go on for far too long. Just double check before you invest a lot of time dyeing. Checking can be a simple as dipping a 2" piece of the yarn in a dyepot for 5 min., remove and rinse. Or a
burn test.
We used Lanaset Dyes yesterday in six colors, suede, wheat, sage green, pink, bright blue and vivid purple. I had 20L of dye bath mixed up and we just ladled some out to use for our dyeing, the women asked how I mixed it up. Most of the time the bath additives are given in terms of WOF but I general determine the amount of additives by the volume of the bath, a standard industry procedure. Both work but yesterday it was more convenient to use the volume approach.
I measure the volume of water. For each liter(about a quart) of water I added:
* 2g of Glaubers salt (sodium sulfate)
* 2g of a penetrant such as Albegal SET or Cibafluid LA
* a pinch of sodium acetate
* 1mL 49% acetic acid
Then I measure the pH, I want a pH of 4.5. If it is higher than 4.5 I add more acid-- drop by drop, if it is lower than 4.5 add teaspoons of sodium acetate. Measure the pH again. Keep adjusting until 4.5 is reached.
The amount of acid needed will depend on your water, my water comes from a limestone aquifer and requires a lot of acid. You may need less. The sodium acetate and acetic acid are used to maintain the pH of the bath; it does not matter the absolute amount that you use, it just matters what the pH is.