Yesterday I tried to make magenta dye from dandelion roots to dye the flowers... and my experiments were unsuccessful. I'm pretty sure that I made the dye incorrectly, however, I have no idea what I did wrong. Instead of magenta, I got more of a brown color....
In any case:
Here is what the dye looked like on the stove.
And here are the flowers... still yellow.
I also tried putting them in vinegar... and there wasn't anything promising there either.