P6_anim_zm_magic_box ╔══════════════════════════════════════════════════════════════════════════════════════════════════════════ Let say, the combination of potassium hexacyanoferrate(III) and phenolphthalein will be the rust indicator. And we use to detect the rusting of the iron nail. And The end result is: the tip, head region with the nail seem blue coloration; the straight region... https://heinzz515vgp9.blogoscience.com/profile