2 different glazes in one mug

[Nouf]

Hello, I have a stoneware bisque mug and I applied a cone 05 glaze on the inside and a cone 5 clear glaze on the outside. Is that okay? Newbie here :)

[Min]

Hi Nouf and welcome to the forum.

Chances are this won't be okay. If it was my mug I would wash and scrub the glazes off, let the mug dry and start again using the appropriate glaze. When experimenting with new glazes it's always a good idea to try them out on test tiles first.

[Chilly]

9 hours ago, Nouf said:

cone 05 glaze on the inside and a cone 5 clear glaze on the outside

If you fire this mug to ^05 the glaze on the outside will not mature, nor will the clay, so it's likely to leak and will be rough in the hand.

If you fire to ^5 the inside glaze will likely overfire and you could end up with a puddle of glaze in the bottom of the mug.

Also, the glazes are likely to expand and contract differently during firing, so could craze and or shiver.

However, some ^05 glazes will fire happily at ^5.  The only way to really know is to test on a similar size and shape as your final product.  It's no good testing on a flat tile, that won't give proper results.

If it's your kiln - have a go, although I would fire on a waste slab of clay, just in case the whole thing melts/collapses.