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PeterH

Member Since 28 Apr 2013
Offline Last Active Today, 03:18 PM
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Posts I've Made

In Topic: New Copper Carb A Way Different Color!

19 March 2015 - 06:33 AM

so the lighter color green has the MOST copper?

 

 

Looking on wikipedia I get:

 

Azurite has 3 copper atoms in a formula weight of 344.67. 344.67/3 = 114.89

 

Malachite has 2 copper atoms in a formula weight of 221.1. 221.1/2 = 101.55

 

So (114.89/101.55) = 1.13 grams Azurite would replace 1 gram of Malachite


In Topic: New Copper Carb A Way Different Color!

19 March 2015 - 03:47 AM

Good post.
 

For the record can you edit the typo in the formula for Malachite, Cu2Co3(OH)2 => Cu2CuO3(OH)2


In Topic: Looking For A Book: "understanding Glazes" By Eppler Et Al.

13 March 2015 - 09:42 AM

Try bookfinder

http://www.bookfinde...anding%20glazes

 

... do a new search, specifying your location and preferred currency.


In Topic: Rims On Slump Or Hump Molds

13 March 2015 - 09:25 AM

The Romans were quite good at it.

Attached File  Samian Stamps, Mould & Bowl_600w.JPG   51.93KB   2 downloads

 

Photo is from http://pottedhistory...e-workshop.htmland shows a replica Samian ware bowl,

together with replica mould and stamps. Note that the mould ends in a frieze, and the pot

is much taller than the mould.

 

I've never seen a clear description of how they did it. Virtually all descriptions I've seen

state that the foot and rim were "added later" and done on a wheel. A few [very vague]

descriptions could be consistent with a wheel-thrown proto-pot being dropped into the 

mould and then expanded into it. In which case it would be easy to leave ample well-

shaped clay to tidy up into a rim.

 

Anybody know how they actually did it?


In Topic: Can I Swap Neph Sy In This Glaze?

13 March 2015 - 09:07 AM

I checked packaging and it is just labelled 'Soda Feldspar' as supplied by CTM in exeter

If it's any help to the discussion here is an analysis from CTM's site

http://www.ctmpotter...elspar Spec.pdf