[Dragonharper]

I find scuptures to be much more challenging than marbles. Go back and work on your marbles until you can get a consistantly round wrinkle free marble. There is more to learn making marbles than meets the eye. First of all they are quite forgiving when it comes to heat and temperature. Secondly learning to read the heat in a marble is a subtle thing, too hot and the punty welds to the marble, too cool and it pops off. Secondly, when is your fish cracking? When you place it in the kiln or when you are reheating it? Where is it cracking? Does it crack between two colors? Does it crack at where two different thicknesses come together? There are lots of reasons for cracking.