I read somewhere that food color needed 1 ml for every gram of fiber - so 5 grams of yarn needs 5 mls of liquid dye etc. A 100 gram hank of yarn would need 4 of the 25 ml bottles of food dye that I usually get! - quite a lot so if I were to use this for a large project, I'd need to find a source of big value quantities. Maybe a catering products company? - but that's for another day.
5 grams of my 2-plyd hand spun yarn soaked for 1/2 hour in 1/2 water, 1/2 vinegar. Then I rinsed the yarn (probably a mistake - the yarn was all clean, the soaking was to get the acidic water all through it - shouldn't have rinsed it away).
Coveren the yarn in water in a small pot, added 5 mls of green color and brought to the boil. Simmered 1/2 hour then left to cool. Rinsed.
This produced a light green dye with quite a lot left in the the pot:
Replaced the yarn in the pot, added more vinegar and simmered for a further 1/2 hour then left it to go very cool in the water.
NEXT, THE BLUE GOODALLS:
6 grams yarn, 50:50 vinegar:water soak for 1/2 hour, then NO rinse, add 6 mls of blue dye to liquid and another glug of vinegar, then replace the yarn; bring to the boil; simmer for one hour then cool and rinse.
As you can see, this is a purplish blue with uneven take-up. It looks more of a navy blue in real life than the photos show. I've noticed this splitting with this blue before - not sure why. It did all take up onto the yarn.
Next I will sample Black, Yellow and Red.