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Post by mohawkpiper on Sept 22, 2017 14:26:26 GMT -6
successful-ish. before...  after...  the blue one is an old glaze... not made with etching in mind... but wanted to see if it would do anything. It is in the bath right now... This is going to be fun... |
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Post by Arnie Benton on Sept 23, 2017 8:09:21 GMT -6
Hi Greg -
I haven't done etching for awhile, but had good results with "Armour Etch". It's a cream so can be brushed on areas of a piece, and you wash it off in 5 minutes, so it's fast.
It's pretty strong acid, so wear gloves and glasses -
Arnie
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Post by jfox on Sept 23, 2017 13:29:53 GMT -6
Nice pumpkins! always reminded fall is coming when Greg breaks out the pumpkins or are those squash  |
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Post by bill2015 on Sept 25, 2017 8:37:54 GMT -6
Greg, Some conversations with Ian in the past.... Seems like glaze thickness has a great impact on etching results. I've tested same glaze using copper carb, black copper ox and red copper ox. Got best results with red copper.
I first used vinegar, but that was a 24 hour soak. Switched to sodium bisulfate, per Ian, 3 lbs dry to 5 gallons water, usually and hour or less soak time.
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gczop
Full Member
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Post by gczop on Sept 25, 2017 9:28:23 GMT -6
Howdy Greg, Am currently doing 3110 base 5% red CuOx, 2% Mn CO3 and 2% TiO2. First two a few minutes in dilute HCl (ground goes to lighter green) and the other two a few hours in dilute HCl. We'll see if 413 base changes things. Cheers, Gordon   |
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Post by mohawkpiper on Sept 26, 2017 1:44:19 GMT -6
Thanks for all the comments... I am using sodium bisulfate as per Ian's notes that Tracey posted on here somewhere at the 1/2 lb per gallon ratio... from Ian's notes yes, glaze thickness is key... I generally glaze my stuff thicker because i like the colors most of my glazes are in the thicker parts, so naturally I want to glaze them thicker and I have to learn to back off a little, but with a few trials I'm sure I'll get it where I want it. personally I don't like using red copper (so hard to get it to mix!.. i know, dish soap helps...) but I just don't like it... but I'll keep that in mind... I am using a hybrid base of 413 and 3110... I had to pull the blue pumpkin out prematurely because I had to head down to southern cali for a wedding... and other stuff went in the bath when I got back before finishing the blue pumpkin... but it is back in now... here is a couple of Pam's mugs... From right to left.. original, two hr soak, 24 hr soak. (the blue pumpkin should look like the mug on the left when it is done.. it's the same glaze)  closer up of before and after...  left is no acid bath, right is 24 hrs..  |
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Post by tileman2 on Sept 26, 2017 5:15:07 GMT -6
Greg:
My 2ยข : I like the results, very well actually.
Tom
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Post by mohawkpiper on Sept 27, 2017 2:11:18 GMT -6
so the crystals on the blue pumpkin didnt come out as white as the ones on the mugs...  a few questions... it is probably just be glaze thickness (the pumpkin IS slightly THINNER than the mugs...) but does clay body come into play here? the pumpkin is b-mix, the mugs are coleman porcelain... does the acid lose its acidity over time? it's been about a half a week since the mugs went in til the pumpkin came out... do you ever change your acid bath? (discard the old, make a new...) if so... how often? G |
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gczop
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Post by gczop on Oct 15, 2017 9:15:33 GMT -6
Hi Greg, Here is a 413 base with 8% Copper Carb and 1% Manganese Carb. Etched with naval jelly (phosphoric acid) just to see the effect . The variations are due to glaze thickness. You might try the mug glaze having copper and cobalt with added 1% or so manganese compound. By the way a few hours in dilute HCl after the naval jelly etch put white coronas around the crystals.  |
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Post by winner on Apr 10, 2018 9:21:41 GMT -6
Please try this it has been my go to Acid bath for years and works great. One gallon water, one cup ammonia. This causes the reaction needed with out the issue of using Acid. When copper is used in the glaze it goes in to the friendship bond state, and this is seen as the color changing when it is wet, and when it is dry changing back to the original color.
I made a very cool sockeye set when the tea was added to the cups and tea pot changed color. Loved it but they did not sell well. I think the public saw them as toxic like the glow in the dark watch faces or som such thing.
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