Good Morning
I have just received my Christine’s BIG crossword book for May 2009 and whilst doing the Diamond crossword I found the clue (violet antiseptic). Your answer was “iodine”. Well iodine is Yellow/Brown. The violet antiseptic is (or was when I was a child, a long time ago) Condy’s Crystal. It has a violet colour.

Would love to hear where you got your answer.
June McDonald