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earthfan

Member Since 11 Mar 2013
Offline Last Active Apr 22 2016 04:21 AM
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Posts I've Made

In Topic: How To Reveal Lace Texture

22 April 2016 - 04:24 AM

I notice that you have pressed lace into the ornaments. What looks even better is to press the lace into a slab of clay about 8mm thick, wait for it to firm up a bit, then remove the lace. Dry the clay slab and fire it to bisque. Use that as your mold for lace texture. It is easy to do on a small scale and your pieces will look as if they have real lace stuck on them.


In Topic: Spodumene

28 January 2016 - 09:12 AM

The spodumene supplied by the Greenbushes mine is a fine sand that is 88% spodumene and 12%silica.  I fired a little bowl of it to about cone 7 and it converted to beta spodumene, puffed up and turned into a fine pink powder. It did not melt at that heat and didn't even fuse to the bowl it was in. Spodumene has one molecule of lithium oxide to one molecule of alumina to 4 of silica, so it is like feldspar, but with a lower proportion of silica. Spodumene has a negative co-efficient of linear expansion. It doesn't shrink when fired, it gets bigger.

 

Lithium carbonate is Li2CO3 and is slightly soluble. That is what you need to spray on the raw clay to get a sheen.

 

"Ceramics Monthly" of February 2015 has an article on spodumene.


In Topic: Look At The Gallery Today. Imprints Of Plants Is Marvelous

21 November 2015 - 08:19 AM

Where is the website?


In Topic: Setting Up And Basic Tools For The Total Beginner

13 November 2015 - 12:25 PM

Don't neglect the traditional hand-building methods. It takes a lot of practise to make a large pot on the wheel, but by using coils, a complete beginner can make a large pot at her first attempt. Slab building also has much potential because you can add texture in ways that are impossible on a wheel. A good tool is a long pastry rolling pin and sets of two wooden slats the desired thickness of the slab you want to make. Even better is a potters' harp, but I don't know where you get them nowadays.

Always make everything bigger than you want them to be because of the 12% to 14% shrinkage. The limitation with wheel thrown pots is that they always come out round. They can be coaxed into ovals and squares, but there is never the shape variation that is available when using coils.

I don't know what sort of wheel you have. Mine is a Venco and it can be easily converted to a work table just by placing a piece of chipboard over the top. Discarded cupboard doors are a good size. Again, fibro cement is the ideal work surface for slab and coil work, so long as it is dampened. Place it over a sheet of plastic to protect whatever you sit it on.


In Topic: Duncan Gold Luster Question

12 November 2015 - 11:27 AM

A different issue: I want to apply lustre to stoneware. Would it fire onto a glaze that was already high fired, or would it require a layer of glaze that would fuse at a lower temperature?