Firing schedule to get large crystals with gold stuff glaze

It is very important which clay you use to make your ceramics.

Do you use porcelain?

Or do you use stoneware?

There are growing many more seeds in the crystal glaze on stoneware than on porcelain.

So you should definitely use porcelain or engobe the stoneware with porcelain.

The glaze layer should not be too thin and the firing temperature high enough.

The higher the maximum temperature, the fewer seeds will be produced.

The few seeds can then be grown into large crystals.

 
Try (depending on your recipe) 1265-1280°C, 20min, then cool down to 1100°C (you can try to vary that a bit) and keep the temperature for 2-4 hours. Then cool down normally.

I reduce in a second firing between 820°C and 600°C (postfire reduction).
A postfire reduction is also called striking.

Some people don't reduce during that, nevertheless the glazes often change significantly.

Of course you can also reduce directly in the first firing when cooling down.

It depends on the effect you want, at which temperature you do it.

If you want to bring copper to red, you can use the above temperature range.

Iron blue glazes are reduced at higher temperatures.

But this is difficult in an electric oven.

Good luck and post some pictures here!

:-)