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Meme taken from friends
Jun. 10th, 2010 12:51 pmFirst of all, OMG I can't believe this good luck!!!!
I had been having difficulty with this exact thing and was wondering why my favorite green glaze with copper oxide occasionally turned blue, I thought it might be attributable to heat work changing the molecular structure, but no, it was the alkalinity of the glaze.
Woo Hoo! As follows:
1. Grab the nearest book.
2. Open the book to page 123.
3. Find the fifth sentence.
4. Post the text of the next 4-7 sentences on your LJ along with these instructions.
5. Don't you dare dig for that "cool" or "intellectual" book in your closet! I know you were thinking about it! Just pick up whatever is closest (unless it's too troublesome to reach and is really heavy. Then go back to step 1).
6. Tag five people pretty much everyone.
"Similarly, substitution of one leadless glaze for another-especially if it is of different alkalinity- can bring about tonal differences. This may especially be true with turquoise of green colours containing copper. With such colors an increase in glaze alkalinity will cause greens to become bluer, and vice versa.
3. The presence of bubbles or undissolved materials in the glaze may change the apparent colour of the decoration showing through. Frequently these bubbles can be detected by a powerful magnifying glass. Higher firing and a longer soaking period and/or applying the glaze less thickly, may then clear the problem."
I had been having difficulty with this exact thing and was wondering why my favorite green glaze with copper oxide occasionally turned blue, I thought it might be attributable to heat work changing the molecular structure, but no, it was the alkalinity of the glaze.
Woo Hoo! As follows:
1. Grab the nearest book.
2. Open the book to page 123.
3. Find the fifth sentence.
4. Post the text of the next 4-7 sentences on your LJ along with these instructions.
5. Don't you dare dig for that "cool" or "intellectual" book in your closet! I know you were thinking about it! Just pick up whatever is closest (unless it's too troublesome to reach and is really heavy. Then go back to step 1).
6.
"Similarly, substitution of one leadless glaze for another-especially if it is of different alkalinity- can bring about tonal differences. This may especially be true with turquoise of green colours containing copper. With such colors an increase in glaze alkalinity will cause greens to become bluer, and vice versa.
3. The presence of bubbles or undissolved materials in the glaze may change the apparent colour of the decoration showing through. Frequently these bubbles can be detected by a powerful magnifying glass. Higher firing and a longer soaking period and/or applying the glaze less thickly, may then clear the problem."
