════════════════════════════════════════════════════*/ Enable say, the mixture of potassium hexacyanoferrate(III) and phenolphthalein could be the rust indicator. And we use to detect the rusting of an iron nail. And the result is: the idea, head region on the nail surface blue color; the straight area seems pink color. I have tried using https://fernandomcsgw.blogsumer.com/35781690/how-limo-hire-newcastle-upon-tyne-can-save-you-time-stress-and-money