I am looking for a good firing schedule to cone 6 to use for velvets. Anyone have a good schedule that they use for these underglazes?
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Posted 13 January 2014 - 05:04 PM
True. But there's some firing schedules better for brighter colors and some work better with an oxidation. I guess that's what I'm asking.
Posted 13 January 2014 - 05:10 PM
velvets are all incredibly stable in oxidation at cone six, Ive never heard of anyone using a particular schedule with them.
Posted 13 January 2014 - 05:23 PM
Ok. The reason I ask is my purple turned blue and some other colors turned pretty dull.
Posted 13 January 2014 - 06:22 PM
Are you applying a glaze over these underglazes at all?
I've never had the velvet underglazes affected by a firing schedule at all. Generally, if left unglazed at ^6, they are a dull matt version of the color they're supposed to be. They don't really represent "true" colors without a clear glaze over them of some sort.
As for color alteration (like your blue -> purple), temperatures can alter the color in my experience (reds fade or orange, blues turn purplish, etc).
Another factor is clay body. On a buff stoneware, the colors will look VERY different than on a porcelain (far more muted / muddy).
on the buff clay
I think we need some more information on what you're doing before we can definitively ascribe a problem.
Posted 14 January 2014 - 11:10 AM
velvets are all incredibly stable in oxidation at cone six,
I respectfully disagree. Some of the colors will shift at cone 6, especially depending on the clear glaze you put over them. Amaco makes a chart showing the differences because of this, HERE. Velvets are formulated for low fire, however many work well at cone 6 and above. The shift is not due due to the clay, but rather that the stains and colorants they use are not necessarily stable at temperatures above low fire. This is especially true for warm tones like your purple. But I have seen much more color shift than what they show on their chart. Test, test, test. I agree with Norm, your firing schedule shouldn't matter. Underglazes do not go into melt like glazes, so the firing schedule has far less effect on them. Firing in reduction will change them even more than shown on the chart.
Posted 14 January 2014 - 11:25 AM
Posted 14 January 2014 - 01:33 PM
Other brands, like Speedball, are more stable at cone 6 (and cheaper). Coyote also advertises theirs as being good at cone 6.
Posted 14 January 2014 - 04:38 PM
Posted 14 January 2014 - 07:33 PM
There is it, Neil. The purple that I got V-322 turns blue at cone 5. Perfect! That's what I needed to know!!!!!
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