I learned from fiber friend via Instagramm that she also has problems with setting blue hues and she told me that she sometimes encountered commercial blue wool which also stains her hands during the knitting... I guess I have to investigate more. RIght now I think I will first knit the wool and then try to set the colour again. But as I have so many unfinished other projects, this will have to wait.
As @shanibeer wrote this would really be a lovely project for children. I have found several yarn dyer who use Easter egg colour or even better kool aid. The latter produces such beautiful pink hues 💕💕💕 Sadly you cannot buy this in Germany. Our lemonade powder (no idea how this is called in English) is nearly translucent and you cannot dye yarn with it.
http://knitty.com/ISSUEfall02/FEATdyedwool.html
I am a bit envious at these colours 😍😍😍