Zhpottery-Epi3.2- Three (Actually 4) Glaze Discussions Part 2

[skiman18100]

How old are you dude?

[porl3004]

hey, just wanted to say thanks for these videos

thanks

porl UK

[zhpottery]

@porl3004 cheers from southern california! thanks fro the support and expect plenty more videos to come in the future

[tatteredgrey]

I have heard of some glazes actually breaking the pots they are on. glazes that are very flux heavy / lots of crazing ( like some ash glazes) Could this be one of these cases? I think that it also has much to do with surface tension / Expansion and contraction ratios of both your glaze and your clay body. That being a porcelain bottle thrown so thinly had me wondering if this might be an expansion and contraction issue being opportunistic of any micro cracking. something to think about.

[zhpottery]

@tatteredgrey thats a good point, im wondering if not glazing the inside had anything to do with it? but you may have a good point in the shrinkage difference between the clay and glaze, i will look into further, thanks

[timseepots]

I am gonna disagree with the assessment that that bottle split because of a glaze run. For a shrinkage split to happen it needs two connection points ie two glaze runs or really messed up shelves. and the crack will be between the two connection points. this crack to me looks like a crack formed while trimming. a piece that was dry. Pushing on a dry piece will cause splits that open up along a weak spot that cannot take the stress. and shows up when it shrinks again(glaze firing)