Childer's effect

mohawkpiper
Administrator

Posts: 274

Childer's effect Sept 1, 2015 12:56:06 GMT -6

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Post by mohawkpiper on Sept 1, 2015 12:56:06 GMT -6

I still haven't really given this a go but just wanted to share for all of those of you out there that do do it a little info?

Maybe you already knew this, and if so then great... I haven't stepped there so i don't know what works and what doesnt.

but I made a few bowls a few months ago for pam and I that I cook with regularly (white food safe glaze inside) and they tend to sit in the sink for a little while in the vinegar and lemon juice and whatnot...

three months later a little white spot started appearing on one, so i soaked it in vinegar for two days and this is what i got...

its our regular "tiger eye" glaze but with the new runny frit, making the glaze thinner. iron and manganese. no copper. so more than just copper works.

I bet the acid bath would do wonders for it. Its the right thickness, as this didn't work with our tiger eye with the frit that doesn't run as much.

G

Last Edit: Jul 28, 2017 1:41:04 GMT -6 by mohawkpiper

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evan cornish-keefe
Junior Member

Posts: 90

Childer's effect Sept 1, 2015 22:28:13 GMT -6

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Post by evan cornish-keefe on Sept 1, 2015 22:28:13 GMT -6

My experience (just throwing the occasional piece in vinegar overnight) is that that manganese and cobalt stained glazes can also be visibly different, lots of copper in a glaze has given more dramatic results. Glaze thickness is definitely a factor.

When I first saw images of etching I thought the white background was porcelain showing through the glaze, but on a very dark brown clay I still often get a white "background".

Last Edit: Sept 17, 2017 10:31:50 GMT -6 by mohawkpiper: image link fix

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mohawkpiper
Administrator

Posts: 274

Childer's effect Sept 2, 2015 15:23:22 GMT -6

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Post by mohawkpiper on Sept 2, 2015 15:23:22 GMT -6

Nice! I like it on the dark clay, it makes for some nice contrast.

Yea i was wondering about the white part...
I bought a piece from Koz a while back that is copper but with the white etched bg. Both that one and the little bowl above turn back to the regular color if you lick it (yes, I licked it...)

And after it dries the white shows up again.

Makes me think, how does the color come back if it were etched out? Perhaps just a thin layer of color etched out but not all the way through to the clay, and that loss of metal in the top layer of glaze makes the white, maybe due to refraction of the light through a porous material, but when you fill it in (with say, water, or in my case, saliva, yuck) it fills the gaps and lets the light go all the way through to where there is color?

Anybody have any input/thoughts/other knowledge on it?

G

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Kuba Full Member SztukKilka in Old Formu Posts: 111	Childer's effect Sept 2, 2015 23:47:42 GMT -6 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Kuba on Sept 2, 2015 23:47:42 GMT -6 Hi Greg, This is what could happen when You etch for way to long P.S. Glaze mainly based on iron and copper.
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adammacmillan
New Member

Posts: 45

Childer's effect Sept 3, 2015 7:49:31 GMT -6

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Post by adammacmillan on Sept 3, 2015 7:49:31 GMT -6

If someone wants to send me two small shards - one of a glaze before etching, and another after (or maybe even the same tile with one half etched?) I will go shoot it using scanning electronic microscope and we can all see what the surface looks like. The piece needs to be no bigger than about 1" square.

Last Edit: Sept 3, 2015 7:50:17 GMT -6 by adammacmillan

evan cornish-keefe
Junior Member

Posts: 90

Childer's effect Sept 3, 2015 9:26:24 GMT -6

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Post by evan cornish-keefe on Sept 3, 2015 9:26:24 GMT -6

Hey Adam,
I have some pieces I could send you. I also saw your post about a machine that could identify what crystals are forming in a glaze, and I have a non-zinc glaze I would be fascinated to know more about.

Here's a glaze with 10% CuC on dark clay, the right was etched overnight in vinegar.

magnified 10X

magnified 30X

Last Edit: Sept 17, 2017 10:32:43 GMT -6 by mohawkpiper: image link fix

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ianchilders New Member Posts: 5	Childer's effect Sept 3, 2015 20:05:26 GMT -6 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by ianchilders on Sept 3, 2015 20:05:26 GMT -6 adam, i have some really good shards that Phil and i used for the original presentation if you want them

Post by mohawkpiper on Sept 1, 2015 12:56:06 GMT -6

Post by evan cornish-keefe on Sept 1, 2015 22:28:13 GMT -6

Post by mohawkpiper on Sept 2, 2015 15:23:22 GMT -6

Post by Kuba on Sept 2, 2015 23:47:42 GMT -6

Post by adammacmillan on Sept 3, 2015 7:49:31 GMT -6

Post by evan cornish-keefe on Sept 3, 2015 9:26:24 GMT -6

Post by ianchilders on Sept 3, 2015 20:05:26 GMT -6