I have a blouse that is essentially Prussian Blue in color. Somewhere along the line a very tiny droplet of either bleach or peroxide (probably the latter in toothpaste) had gotten on the front of the blouse. I figured, what the heck, and "wrote" on the shirt with my Prussian Blue. I thought most inks do stain to some degree and what was left after a wash would probably be enough to make the white area unnoticeable. the ink was left in place for at least a week.
well, did the laundry yesterday and when I hung up that blouse - the white spot is back.
One thing - the shirt has no natural fibre content so perhaps the fibres are rather resistant to staining. But the other thought of course is that Diamine Prussian Blue is quite washable. This could be good or bad depending on your preferences. For me it isn't really either.
but I will have to find a different way to fix that spot. or just reapply every time after washing.
