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Vitraglaze Stoneware Glaze: Oil Spot Base 1

SKU: G157B

A smooth and rich glossy black stoneware glaze that has been designed to be used in conjunction with our latest limited edition Oil Spot set. Formulated for reliable results on Vitraclay stoneware clay bodies, it performs beautifully as a brush-on, dipping, or layered glaze.

£10.09

£8.41 ex. VAT

22 in stock
More details

Product Details

Product Information

Our very own Stoneware Glaze range, tested on all our Vitraclay bodies.

Available in liquid brush-on (ml) and powder (kg).

Real Oil Spots originate from China (Song and Jin Dynasties). They are famous for having a shiny metallic spot of varying sizes from an iron rich dark background. They were made in a reduction atmosphere where the
iron decomposing would react within the glaze changing the iron’s chemistry, crystallizing into patterns which are more reflective of light than the rest of the glaze.

This is an Oil Spot Base variant along with Base 2 and Liquorice Black, that will work with a topcoat of our current Vitraglaze Tin White Speckle, Vitraglaze Matt White and temporary Vitraglaze Zircon White.

This glaze is available until the end of December 2026.

Order before the promotion ends to avoid disappointment.

Firing and Working Notes

Firing Range:

1240°C to 1260°C (Cone 6 to Cone 9@60°C/hr).

1232°C is a magic point where iron releases its oxygen atom and therefore we advocate a high temperature Cone 6, but it must be noted that the glaze is likely to run at higher temperatures.

The sample shows two applications on Vitraclay White Throwing Clay, fired to 1240°C.

Suitable for Stoneware clay.

Working Notes:

Application is key with this glaze and technique. For best results, apply base coat generously, allow to dry preferably overnight. Then apply the white topcoat, load a soft brush with a generous amount of glaze, apply confidently but don’t drag the brush or you will disturb the underlying glaze. You can water down the glaze if it helps. The amount you will put on will affect the concentration and size of the spots. A light application will result in smaller spots, a thicker one, will run, looking more like hare’s fur.

If you wish to use the Oil spot base 1 or 2 on their own, when fired to 1280°C, they will do the authentic metal shiny speckle. Base 2 is more subtle than Base 1.

If choosing a powder, the mix could benefit with flocculating with Epsom Salts (Magnesium Sulphate).

Note, if using a white topcoat as a dipping mix, a little CMC would help slow the drying process to reduce the chance of cracking and potential crawling. Another way would be to add water to the white topcoat brush-on mixes and use as a dipping or pouring mix.

For advice and tips on using a brush-on glaze, read our Application with a Brush.

For advice and tips on powdered glazes, read our More About a Dipping Glaze.

For information on food safety, read our Food Safety in Ceramics.

Health & Safety

Lead-free.

Refer to each SDS below for the individual hazards of each glaze.

General Advice:

When handled safely, a brush-on liquid glaze poses no risks, but avoid ingestion and contact with skin or eyes.

A powder or dried brush-on glaze presents a hazard as it may contain crystalline silica and other materials. When working with powders or when cleaning, wear an FFP3/P3 mask and filter and use a wet sponge.

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