My Digna DK/Worsted weight yarn base is from Rauwerk (see below) and has been dyed by me using natural dye extracts, together with an alum mordant.
Main dye: Chlorophyla [base yarn: white]
--- a tonal soft, light green ---
I have taken great care to thoroughly soak and rinse the yarn before winding it, but - as with many dyes - there is still the possibility of small amounts of residue dye remaining in the fibres. With this in mind, you should wash your yarn/garment separately, using a gentle wool-wash for the first few times.