??? ?? ??????? ????? ??? ????????. ?????????? ????? ? ??????? ??? ???????? ???? ?? ?????????? ??????????? ?????? ????: ??? ?? ??????? ????? ??? ????????.Let say, the combination of potassium hexacyanoferrate(III) and phenolphthalein may be the rust indicator. And we use to detect the rusting of the iron nail. And the result is: the tip, head area o… Read More