Firstly I went on a dyeing course at The Handweavers Studio (the course was fabulous - I'd recommend it). Each person tried different dye recipes and at the end we compiled all of the recipes and samples into a reference:

The next step was to try the process myself at home. The Handweavers Studio sell both Acid Based and Fibre Reactive Dyes. However they do not sell Glaber’s Salts ( leveling agent) so I found it at Fibre Crafts website.

I dyed 5 gram samples of yarn and then scaled up to 100g hanks.
For the 5g samples, I put each sample in a plastic bag (a cook-in-the-bag) with the ingredients:
5ml Glauber Salt Stock (stock is 100g gs to 1000ml water)
5ml Vinegar
3ml Dye Stock (stock is 5g dye powder to 500ml water)

then 100g hanks:
100ml Glauber Salt Stock
100ml Vinegar
300ml Dye Stock
What I found was the colour was stronger on the 100g hanks. I’ve no idea why – I suspect the plastic bags might be semi-permeable so maybe some dye was lost. 5ml is difficult to measure accurately so maybe I put less in. also 3ml dye stock is more than required for a saturated colour.
Also, despite the glauber salt, I got a bit of streaking at the lower concentrations.
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