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LauraAnna

Member Since 30 May 2013
Offline Last Active Jul 01 2013 12:10 PM
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Topics I've Started

Your Best Guess On Overglaze/Lustre Technique

05 June 2013 - 03:38 PM

Two-part question:

I'm a semi-noob, but avid learning/researcher/student. I'd like to replicate a procedure posted by another kind user here using an old light diffuser grid as a press mold to make tiny mosaics. Her prototypes turned out beautiful. Since my intended use is wall tile, I understand it's best to use ^6 clay. This means I also need to glaze at compatible ^6 level as well, correct? So far so good. Ultimately I'd like to finish with a mother of pearl overglaze/lustre. Now it gets interesting...

I fell in love with a lustre effect I saw on a boutique tile. (Nothing easy is as much fun, right?) I found this tile in the store but they don't make tiny sizes and besides, it's crazy expensive (pic attached). The appearance is a creamy base color with a heavy rainbow iridescence and they call it their "metalics" line. In the pic below it almost looks mirror-like but not so much on a single tile. After everything I poured over on this site I am starting to suspect this possibly was fired four times -- third time for some kind of white gold or platinum metallic lustre and then a fourth time for a mother of pearl/opalescence (??) or maybe just MOP?

Your guess???

Second part -- I found Duncan Mother of Pearl Lustre Overglaze and would like to try it (or anything else equivalent that you can suggest). Many of you say the MOP can be applied over mid fire glazes, and fired for 3rd time at very low ranges (ie. ^018). With that in mind, it sounds like this can be applied over a ^6 glaze provided that it is fired at the mfgr recommended ^020. However, the Duncan website lists something I find somewhat confusing - specifically step #1 & #2.

Here are their instructions
1. Apply an overglaze compatible glaze to cone 04 bisque.

2. Fire to cone 06.

3. Do not stir or shake overglaze.

4. Place a small amount of overglaze on a glazed palette:

a. For a swirled look, swirl on one coat, overlapping strokes.

b. For a smooth look, brush on all strokes in the same

5. Correct application should produce a light blue tint.

First off, what is a "overgalze compatible glaze"? Secondly, are they saying I need to apply a glaze to the bisque with a glaze that only fires to ^06? That would mean I'd have to use a low fire ^06 clay (?) Surely they are not saying I should fire the lustre to ^06 -- everything I've read on this forum says that's too high and would burn off. Does this mean I cannot use Duncan Mother of Pearl over a ^6 clay fired with a ^6 glaze? If not - what then do you recommend for Mother of Pearl on cone ^6 glaze? Or can that even be done?

thanks so much for reading!