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Pottery Supplies and Production Services
Purchases are couriered or rail network shipped NZ wide and overseas.
Customers are welcome to pick up by appointment from the factory after your order is prepared.
126 Summerhill Drive
Tel 06 356 9886 or 0800 667 229
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Frequently asked questions
BLACK CLAYS – SAFE OR NOT?
Quite rightly, concerns exist around the safety of black clays in the studio and on functional ware.
It is true that historically, some black bodies have been coloured with Manganese Oxide which is a toxin. Years ago, Decopot declined to purchase such bodies from an Asian supplier.
NIGRA 2002 sold under the Primo-Pro label is manufactured by a reputable European supplier and widely sold throughout Europe.We have our supplier’s absolute assurance that this body (pigmented with manufactured stains) is safe to use.
How much water should I add to the powder?
Add 1Kg of glaze to 1 – 1.25 litres of water. This will varyfrom glaze to glaze. Remember that it is easy to add more water and not so easyto take excess water out. It is therefore a good idea to withhold some of themixing water for fine adjustments of the glaze density after the initial mixinghas occurred. The glazes should have the consistency of thick cream when mixedand sieved (80#).
A paint stirrer on a power drill or battery drill is hard tolive without.
How can I prevent the glaze settling on the bottom?
The glaze composition is largely determined by the effectsthat characterise that glaze. Consequently some glazes suspend easily in thebucket and others need help. The first rule is to avoid over-watering theglazes as there is no way that a very thin glaze will suspend well. Some glazeswith very low clay content can be treated with bentonite and a flocculant toaid suspension. Our preferred flocculant is plaster of paris – it is cheap,most of us have some in the studio and the effect is long-lasting. Alternativesare Epsom salts and calcium chloride. Pre-disperse the flocculant in water andadd the resulting slurry gradually to the mixing glaze. As a rule of thumb youmight use one or two teaspoons of plaster per bucket of glaze. Adding bentonite(in similar quantities) can also contribute improved suspension and betterbound glaze surfaces. Add the dry bentonite to water, blitz with a milkshakemaker (or mix by hand and stand overnight) and also add gradually to the glazeuntil the right smooth creamy texture is observed. This sounds complicated butit becomes second nature after a while.
If your glaze hassettled into a hard layer with clear water on top, first scoop off (andreserve) most of the clear water. The glaze can then be (manually) redispersedin the remaining water to the desirable consistency. Add back as much of thereserved water as needed. Glazes that have settled like this will almost certainlyneed the bentonite/ plaster treatment to keep them suspended. They should havethe consistency of yoghurt when they have been allowed to stand for a few daysbut should be easy to redisperse with hand mixing.
How do I set up a brushable glaze using Universal medium?
This medium is the basis of all Abbots brush-on glazes.
Any dry glaze material can be dispersed in this medium(rather than in water) to produce a thixotropic gel suited to brush application. This enables multiple coats of glaze of one or more varieties to be applied without risk of peeling or blistering. The risk of crawling is lessened due the strong bond between glaze and body.
We suggest adding glaze to medium in a ratio of 1-1.3 parts glaze to 1 part medium (by weight). Vary these proportions or add a little water to achieve the density and brush-feel that works for you.
Disperse the glaze in the medium using a stick blender or power mixer. Sieve through an 80# sieve once or twice before using.
Why does my glaze craze, and should I care?
For larger shipments savings can
be achieved by accepting freight on a pallet, delivered by truck.
If you can safely receive freight of this type at your address and in person then you may wish to select this option.
Once you have received a tracking number we advise making contact with the carrier to discuss the details of your delivery.