David wrote:

....
another tip: practice any new finishing technique or new-to-you material
on plenty of representative scrap material; not just on a couple square
inches of scrap.

Sounds like a significant part of the problem here was not testing on
all separate material components of the project individually to see the
differing effect.

I'd also suggest that analine dyes are a particularly unforgiving
species and should probably be left for later on in the arsenal of
newbies after practicing on multiple less significant pieces before
attacking a real prize piece.