[mkarliner]

Interesting, I'll have to think about that. Actually, with rare earth paints, the big issue is persistence, which is rather too long. In the current script, I only turn the drum 1/4 turn, so it takes roughly 4 minutes to illuminate the same patch again. Otherwise the lowest digit tends to be blurred because it is a combination of the last two values.

[thanatos519]

Have you tried 360nm LED? The higher orbitals drop faster or so I've been told.

[mkarliner]

Another interesting suggestion to think about. Thanks.

[avidiax]

Maybe you could make a clock based on a cylinder of sealed powder. You draw the time on it, and when it's time to update, you rotate the cylinder enough to mix the exposed powder and draw the next time.

Maybe the same thing could be done with beads and something similar to the marble machines to replenish a screen of beads, then dump it when the time is invalid.