Extract the color adding soda ash.
The first extract tends to be yellowish compare to the second and third.
Some people prefer to dye with only 2nd and 3rd extracted color water to get real green.
I added soda ash only for the first stock of dye water.
The result, with “eco-friendly copper” mordant.
The color nuance are different on three yarns here:
cotton(left), silk noil (middle) and factory made white silk (right) .
Below is the eco friendly copper product by Aikuma.