I used Jacquard acid dyes on half of my handspun yarn from ten breeds - this was my first time dyeing on different colored bases and I'm loving the hues! : r/YarnAddicts
Jacquard Products — Acid Dye Set
ChemKnits: Swatching Acid Dye Powders on Yarn
Jacquard Acid Dye 4 Color Set W/Citric Acid-Yellow, Turquoise, Red And Black : Amazon.de: Küche, Haushalt & Wohnen