P6_anim_zm_magic_box ╔══════════════════════════════════════════════════════════════════════════════════════════════════════════ Let say, the mixture of potassium hexacyanoferrate(III) and phenolphthalein would be the rust indicator. And we use to detect the rusting of the iron nail. And the result is: the suggestion, head location in the nail surface blue coloration; the straight reg... https://tropicallimos.co.uk/services/