The colouring amethyst gets a random stroke on average once in E 68 s. With the chance of one out of five, he tries to grow a bouton on one of the six sides selected at random: there's a small boutoon on the empty side that's already standing up. The water doesn't bother -- the bouton grows beneath it.

It turns out that some side of the block grows on average once in ~ 6 minutes, and one side passes through 34 minutes and reaches Druze in 2 hours-17 minutes. There's nothing to accelerate: bone flour does not work on an amethyst.