I had a problem in buying a beige bra extender. There are white ones & black ones, black ones no problem, but as 75% of my bras are beige, I found that the white extenders can be rather obvious, under some of my tops.
Then I remember that if you get a cup of instant coffee, soak the white extender in, and yes there you have a nice beige Bra extender.
I hope that this is helpful, or you problem knew about this trick all the time
In a store that I was in one day (not nationwide store) they had the
extenders...all white!!! Couldn't believe it, no black or beige. As
it turned out, went to 2 more stores before I could find white and
black, still no beige.
Your idea works, I just now saw your post and tried it...PRESTO!!!!
No cost!!!! What a deal.