Rosie
de
United Kingdom
asks
Hello,
I was just wondering if you have the water to powder ratio for mixing this glaze?
Thanks!
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Réponses de Scarva:
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Simply mix 700-800mls of water per 1000grams of powder, pass through a fine mesh pottery sieve and adjust if necessary to a thin cream consistency, hope this helps.
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Jogita
de
United Kingdom
asks
Does this glaze contain Zinc?
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Réponses de Scarva:
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No this glaze does not contain any zinc oxide, hope this helps.
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Pam
de
United Kingdom
asks
I've used this glaze on Commercial White Earthenware but every item has crazed. Can you tell me the optimum firing for this clay with this transparent glaze. Thanks.
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Réponses de Scarva:
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Earthenware glazes are prone to crazing due to not fitting the clay body. Sometimes it is possible to do a high bisque and low glaze but then it can be difficult to get the glaze to fit the clay body. For functional pieces it is much easier to choose a stoneware clay body and stoneware glazes then it is possible to do a normal bisque to 1000oC and high glaze. Hope this helps.
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Ann
de
United Kingdom
asks
Hi. I have used this glaze over your Scarva white decorating slip on top of terracotta clay. I have found that it has crazed. I am new to pottery and would welcome any suggestions about what I am doing wrong. Thanks
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Réponses de Scarva:
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This is a common problem with earthenware glazes. It is due to bad glaze fit, it is difficult to solve due to the nature of the clay bodies at this temperature. Sometimes you can do a high bisque then a low glaze but then getting the glaze to adhere to the vessel is very difficult. Ideally choosing a stoneware clay and stoneware glaze is the easiest solution for getting good glaze fit.
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Helen
de
Ireland
asks
I have had problems using this glaze in that it blisters. I fired to 1140 c. On earthenware. Is it because it is applied to thickly or because it is better slightly lower temp? I bisqued to 1000 c
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Réponses de Scarva:
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Blisters would suggest that the glaze is overfired. I would try to lower the temperature and see if the results improve.
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Nichola
de
Ireland
asks
If I was to buy this in powder form, would I have to mix it with the glaze medium to make a brush-able glaze or is it only suitable for dipping?
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Réponses de Scarva:
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Yes you would have to mix with brush on medium to create a brush on glaze if you mix the powder with water it may only be used for dipping or spraying.
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Chanele
de
Ireland
asks
I’m experiencing hundreds of tiny bubbles all over (look like they’re in the glaze) after firing to 1080c w 20 min hold. It’s not blistering as it still feels smooth to the touch.
I bisqued to 900c - would you recommend bisque firing to 1000c?
Any other advice to avoid these bubbles? Thanks!
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Réponses de Scarva:
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Hi, it sounds like gasses coming from the clay body. Scarva suggests bisque firing to 1000°C as it may help release some of these gasses before the glaze firing. Hope this helps!
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kate
de
United Kingdom
asks
Is this glaze ready mixed or powder? I'm looking for an earthenware transparent glaze that isn't premixed, thats just in powder form. Thanks
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Réponses de Scarva:
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Our range of Scarva glazes are available in powder or brush-on form. Powder is displayed as grams (g) or kilograms (kg). Brush-on is millilitres (mls) or Litres (Ltrs) so for example powder will be 1kg or brush-on will be 1ltr.
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Frances
de
Ireland
asks
I've just purchased 2.5kg of your GZ2108 low fire transparent glaze. I've only used premixed glaze before, can you tell me how much water to mix with this amount of powder? I'd appreciate answer asap. Thanks.
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Réponses de Scarva:
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We recommend mixing approximately 700ml of water to 1000grams of powdered glaze. A normal glaze should have the consistency of cream however as this is a transparent you may want it a little thinner as transparent glaze tends to give better results when applied thinly on bisqueware, if applied thickly it tends to go cloudy.
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Emily
de
United Kingdom
asks
I have fired my clay to 1250'C (as i want it to be displayed outside) do i have to use a stoneware glaze, or can i use a earthenware one?
Also , we have used under glazes on the work. . . . can I apply the clear glaze straight on top of this, or do they need a firing before?
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Réponses de Scarva:
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Ideally when using a stoneware clay you would bisque fire to 1000oC as normal then high glaze fire to at least 1200oC in order to achieve an object which frost proof.
In this case however you have bisque to 1250oC which means you can use and earthenware glaze the problem you will have is getting the glaze to adhere to your vessel as it is non porous. There are a few ways of achieving this heating the pot up, mixing your glaze with gums to help it stick on or using brush on glazes either way you still may find it difficult to achieve an even coverage.
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Steve
de
Ireland
asks
How is this glaze for raw glazing onto green ware?
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Réponses de Scarva:
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Scarva does not recommend raw glazing, a bisque firing first to around 1000oC before applying any glaze decreases the risk of problems during the firing.
While raw glazing may seem like an attractive solution as it only requires one firing the risk of something going wrong is greatly increased. Issues include the glaze not adhering to the ware correctly or thickly enough. Handles or additions to a vessel may come lose and fall of as you are effectively applying water to a piece. During the firing steam from the clay turning into ceramic may cause glaze to spit of damaging surrounding work, the kiln walls but most importantly damaging the kiln elements.
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