I was playing around with a sample piece of silk the other day.
I dyed it in blue,
let it dry,
squeezed some blue school glue gel
directly from the bottle onto the silk,
then immediately applied yellow dye.
The silk piece turned out a lovely Teal
(which was what I was striving for,
but I have no photos-
you'll have to trust me on that!)
and this was on the piece of polyester underneath.
Such a pity that it will wash out!