Liner Glazing a Stoneware Mug

I will show you how to glaze a mug with a liner glaze inside and a colored one outside so that they meet in a perfect line at the rim.

B. Glazes

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There are decorative and functional reasons to glazing the outside and inside of mugs as a separate operation. First, liner glazes are far less likely to leach harmful things into food or drink. Liner glazed mugs advertise to your customers that you are thinking about this. There are aesthetic reasons to have a different glaze inside and out. If your mugs have thin walls, glazing them in one operation is much more likely to water log them (glazes are much less likely to crack or bubble when they dry quickly). This method enables handling the mugs seconds after the final outside coat so that you can sponge the foot ring quickly.

For this to work well your wax needs to be the right consistency (not too thick). And it needs to dry for a while to resist better. I have found the Laguna Premium Wax resist works well. But Reed Wax is even better. Also, your glaze must not be too thick or heavy. Adjust the slurry to 1.43-1.45 specific gravity and add epsom salts to gel it to creamy consistency (stir the bucket, pull out the spatula, it should stop in 2-4 seconds). That will resist well.

Out Bound Links

  • (Glossary) Liner Glaze

    It is common to glaze food surfaces of utilitarian ware with a brilliant glossy white or transparent glaze called a 'liner glaze'. This is done to avoid releasing in-glaze or on-glaze metallic colorants to food or drink (which could leach them away and be a health hazard). Liner glazes can be applie...

In Bound Links

  • (Articles) How to Liner-Glaze a Mug

    A step-by-step process to put a liner glaze in a mug that meets in a perfect line with the outside glaze at the rim.

  • (Articles) Is Your Fired Ware Safe?

    Glazed ware can be a safety hazard to end users because it may leach metals into food and drink, it could harbor bacteria and it could flake of in knife-edged pieces.

By Tony Hansen

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