And here is a smell from childhood, we used to make a drink from fresh elderflowers. I wanted to try this for a while now, it gave a beautiful and quite even bright yellow in just 10 minutes.
The recipe is usual for dried flowers, put as many as you have (I had a lot, so I put maybe 40g), add water (enough to submerge 1 egg and a little extra), simmer for about 10 min, drain the liquid and add alum to it, once it’s cool, use as dye.