Ariel would have declined, if only because it had been a long time since he'd felt this steady, and that alone was novel.
He found a dropper amongst his supplies, and after making sure it was in working order, he reached into the bowl containing the chemicals. It didn't matter how much he drew from that bowl, but a mere drop ought to be enough to saturate the skin. If he'd done this right. If this was the right animal. So many ifs.
It was even possible to ignore the demon, when this was so near. He couldn't even smell the brimstone, not when he was this focused. There, just a little more, just enough pressure -
The drop fell from the tool, and the grey skin instantly transformed into a bright shade of yellow, so vivid and deep it looked like gold leaf. Ariel couldn't restrain a low cry of triumph.