Over-baking Sculpey

Just tried the over-baking curing technique for Sculpey! 1hr @ 225 degrees, 1hr @ 250 degrees, 2 hrs @ 275 degrees. It’s very dark but beautifully hard! The color went from a 50% gray* to a rich chocolate. Has any one else tried this technique? I’d love to compare notes.

*I use a blend of Sculpeys to get a 50% gray:
1 box Sculpey
1 block white Sculpey III
1 block black Sculpey III