CTM Potters Supplies - if you use clay you need CTM

Doncaster Tel: 01709 770801

Simba Materials Limited t/a

CTM Potters Supplies Co Reg No 05659119

   Doncaster Fax : 01709 770803

doncaster@ctmpotterssupplies.co.uk     Unit 8 Broomhouse Lane Industrial Estate, Edlington, Doncaster DN12 1EQ

Delivery charges and VAT will be added on to all orders. Prices on this website and in all downloads are net of VAT. Prices are subject to change without notice.

Exeter Tel: 01395 233077

   Exeter Fax : 01395 233905

admin@ctmpotterssupplies.co.uk            Unit 19 Hogsbrook Units,Greendale Ind Estate EAST, White Cross Road, Woodbury Salterton, Exeter EX5 1PY

All prices are in GBP - often per kg - and need delivery and VAT to be added. For some items there are pictures or more information if you press on the link. You can order by email, phone, fax but but you cannot pay online - please see ORDERING

Please Note

Delivery Charges

CONTEM Underglaze Powders


Over the past three years we have talked to customers buying the Powdered Underglazes and we found that 95% of customers were using them as stains to colour glazes or decorating slips and so we decided to replicate these colours in our Glaze Stain range and discontinue the Powdered Underglazes.

We have extended the range of Contem Glaze Stains - there are now 66 stains.

So, all of the colours that you could get in this range are now available as more powerful stains - of course if you add them to decorating slips or into clay they will still become pastel but when added into transparent glazes you may be able to use less.

Stains are not Powdered Underglazes. If you want to use a stain as a powdered underglaze you must add extra materials.

The Powdered Underglazes included carriers such as Quartz, Fluxing Agents such as FS200 or lithium carbonate and basic transparent glazes such as G14 to enable them to stick to the surface of the clay  - when using them as if they were a stain you did not need these extra materials and so the stains will be more effective for you.

If you want to make Powdered Underglazes out of the stains a typical recipe is as follows:-

52% Stain, 22% Transparent Glaze, 22% Quartz 600, 4% FS200 Flux or 1% lithium carbonate …

or …

for a strong stain such as a dark blue or dark green typically 25% Stain, 22% Transparent Glaze, 49% Quartz 600, 4% FS200 flux or 1% lithium carbonate


This powder would then be mixed with UGM / Water at an equal weight to make a liquid. This is a rough guide only, you must test them yourself. The transparent glaze and quartz are relatively cheap materials and the FS200 is available from 250gm lots.  Test, Test, Test.

If you were purchasing several kilos of a particular PU colour before then we can mix it for you but we cannot mix less than this quantity due to they way our mixers work.