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PeterH

Member Since 28 Apr 2013
Offline Last Active Today, 09:23 AM
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Posts I've Made

In Topic: Slip Trailing

19 July 2016 - 07:48 PM

I'm having trouble with my login - sometimes it lets me in but most times not.

 

CeramicArtsDaily are having trouble with their password handling, so it's not just you.

 

Try going through the steps in:

http://ceramicartsdaily.org/faq/

... it [eventually] worked for me.

 


In Topic: Slip Trailing

19 July 2016 - 05:37 PM

raised like slip so think I need to add a flocculent such as vinegar.

 

A rambling response based on too much theory and far too little practice.

 

In an ideal world you want to finish up with a mix with both

- the right consistency to trail

- and the right water:solids ratio to control the volume-loss on drying.

If you start with a dry mix you can control both over a significant range, as shown in this John Britt video:

 

If you are starting off with a premixed slip your options are more limited, as you cannot decrease the

water:solids ratio. Hence the comment:

Leach gives the useful tip to add vinegar to a trailing slip, particularly if it turns out to be rather more

runny than you wanted. The vinegar acts as a flocculent, and stiffens a slip in an amazing way, while

in fact diluting it so that it dries to a satisfying low relief.

http://www.ceramicar...net-kovesi-watt

 

So my guess is that with a premix you may need to flocculate to get a good trailing consistency, but

the fired trail may be thinner than you expect (as the water:solids ratio is probably on the high side).

 

PS Have you seen the underglaze freebie, downloadable from:

http://ceramicartsda...rglaze-pencils/

 

 


In Topic: Slip Trailing

19 July 2016 - 09:36 AM

Isn't this mainly a slip versus engobe issue?

http://ceramicartsda...tery-materials/


In Topic: Relay / Magnetic Contactor Question

17 July 2016 - 06:03 PM

A long shot, but a firm called "Kilns and Furnaces" exists in the UK.

http://www.kilns.co....lectrical-items

http://www.kilns.co.uk/contact-us

 

Might be worth a query.


In Topic: Metallic Gold At Cone 10?

11 July 2016 - 05:05 AM

Takes me back to trying to emulate Hans Coper's 'bronze' effects in the 1970s.

 

High-manganese mixtures and saturated glazes can produce some truly magnificent effects,  but

went out of favour when serious H&S issues were suspected. [Indeed Hans Coper's neurological

problem were rumoured/suspected to relate to his use of manganese.]

 

Like many H&S issues there are few hard facts. A fairly random google gives this as a starting point.

https://digitalfire....odgett_409.htm

 

Putting something like this in a communal kiln seemed like a good idea then. :o