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Member Since 04 May 2013
Offline Last Active Nov 13 2016 09:02 AM

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Newbie questions about firing and mildew

04 May 2013 - 03:12 PM

Glad to have found this forum and hope someone can help me with some basic questions!

I am making ornaments - I am using a cone 6 porcelain - i have rolled out the porcelain on a pasta machine to about 1/8" thick.
I have had success making my ornaments, but am having problems once I have glazed them and start painting them (china paints). Apparently I am not firing correctly, because after all this work, I am finding many pieces with mildew spots.

So, I am running a new batch. This time I am firing very slowly - turning up the heat half a notch every hour or so. I don't have any fancy controllers on my kiln - it is only a doll kiln with a kiln sitter.

Anyway, I plan on firing to cone 04 and then sanding down the rough edges and refiring to cone 6 and then glazing at cone 06. Here are my questions:

1. After I have fired to cone 04 and then sanded the edges down, when I refire these to cone 6, do I need to slowly ramp up the temperature again, or does all the water come out with the first firing? Or can I just fire them on high until it reaches cone 6?

2. Am I in the right ballpark in assuming that my mildew problem is from trying to fire too fast the first time and excess water is not getting out?

Thanks for any help you can provide!