gczop
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Posts: 202
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Post by gczop on Apr 3, 2017 9:05:06 GMT -6
Bottles before (other was similar) and after 1500f post firing reduction. Glaze 3110 base first layer 5% TiO 2, second layer 2%TiO 2 and 3% FeOx red. (a small amount of glaze ran off each in firing) Appearance suggests that slight differences in glaze thickness are responsible for the color variation in the reduced pieces. G   |
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Post by jfox on Apr 3, 2017 21:02:34 GMT -6
that green is surprising i would expect blue
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Post by mohawkpiper on Apr 4, 2017 12:00:17 GMT -6
i feel like you got more of the striking effect with the post fire and less of the reduction effect. how much did you reduce and for how long?
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gczop
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Posts: 202
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Post by gczop on Apr 5, 2017 9:13:19 GMT -6
The green is indeed a surprise. The reduction is at 1500f for about 15 mins with propane. The glaze is thin and opaque so for me there are no visual clues re striking and reduction; good question which we can likely answer with more firings. Below two pieces are a variation of the above, one layer only: Right 3110 base 5% TiO2 and 3% FeOx red. Left 413 and 3124 frit replacing 3110 in base with 5% TiO2 and 3% FeOx red. Same total glaze thickness and post firing reduction as the bottles.  |
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Post by mohawkpiper on Apr 5, 2017 14:24:47 GMT -6
iono. hard to say.
you are right about more firings will tell.
i felt like 15 min of reduction wasnt really enough but clearly you got results in the single layered ones so maybe it's right on the edge.
re-looking at he multi layered ones it looks like the rims got reduction so maybe its a combination of several things...
where the multi layered ones are too thick in most of the body in conjuction with the higher titanium amount glaze being masked by the lower titanium amount glaze (2% titanium isnt much for reduction) in conjunction with the reduction time being barely enough for the more blue-purple color from reduction to come thru?
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Post by mohawkpiper on Apr 5, 2017 14:28:55 GMT -6
with post fire reduction i think you really only get surface reduction whereas higher temp straight reduction you get full glaze reduction so maybe its more the two glazes arent mixing much and the top layer glaze doesnt really have enough titanium to reduce well.
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Post by Arnie Benton on Apr 5, 2017 15:12:31 GMT -6
In the thread named striking at 1300, 1350, etc I posted pictures if a piece struck at 1350, 1450 and 1650 - that can give you an idea about what striking by itself does - you might get more distinct crystals if you do the reduction closer to 1350 -
Arnie
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gczop
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Posts: 202
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Post by gczop on Apr 7, 2017 8:28:29 GMT -6
Striking/reduction: This dish underside coated with a thin layer of the leftover from the 413-3124 frit with 5%TiO2 and 3% FeOx red. First photo is after firing, the ground is a light tan. Strike firing to 1500f for about 15 min slightly "bleached" the ground to make it appear more white (no photo available). The piece was then reduction fired to 1500f for about 15 min. resulting in a sort of violet. Cheers, G (photos are retouched to get a fairly accurate color for the ground)   |
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