brent
fully equipped rock polisher
Member since November 2008
Posts: 1,316
|
Post by brent on Dec 18, 2011 12:34:26 GMT -5
I cut some brazilian agate last week. The bottom one I cleaned up then, the other one was in the wash tub frozen in ice till today. couldn't believe the difference. I know about heat treating, but never thought about freeze treating ;D
|
|
|
Post by roy on Dec 18, 2011 12:41:30 GMT -5
nice slabs
|
|
steveo
spending too much on rocks
Member since October 2011
Posts: 273
|
Post by steveo on Dec 18, 2011 12:51:58 GMT -5
Real nice quite a difference.
|
|
|
Post by rockrookie on Dec 18, 2011 12:56:07 GMT -5
neat !! --paul
|
|
|
Post by deb193redux on Dec 18, 2011 13:18:06 GMT -5
I do not think cold can do this. I have to wonder if there is some other explanation. Are you sure the difference was not there when 1st cut?
|
|
brent
fully equipped rock polisher
Member since November 2008
Posts: 1,316
|
Post by brent on Dec 18, 2011 13:32:11 GMT -5
It was the same all the way through. These two were next to each other.
|
|
|
Post by deb193redux on Dec 18, 2011 16:29:25 GMT -5
Well throw the plain/unfrozen one in water for a week, and then inspect. Then throw it in ice for a week and inspect. I would be keen to know what you find.
Heat alters color via oxidation, usually of iron impurities. Cold cannot accelerate a chemical reaction. I wonder if it was something in the water difusing into the rock.
interesting mystery
|
|
|
Post by parfive on Dec 18, 2011 16:41:04 GMT -5
The two sides shown are not adjacent faces. If they are adjacent slabs, how big a difference when you flip one and compare both sides of that particular cut?
(Are you cutting with oil or water?)
|
|
brent
fully equipped rock polisher
Member since November 2008
Posts: 1,316
|
Post by brent on Dec 18, 2011 23:39:09 GMT -5
I cut with oil. I put a slab halfway in water and it's in the freezer. This is the first time I have ever seen something like this happen. The two are from beside each other, it's just how I scanned them that makes it look off.
|
|
brent
fully equipped rock polisher
Member since November 2008
Posts: 1,316
|
Post by brent on Dec 18, 2011 23:44:43 GMT -5
Here is the result....the top pic. Now the bottom slab from the freezer. The line is roughly the water line.
|
|
|
Post by frane on Dec 23, 2011 22:18:29 GMT -5
The frozen one sure looks more vivid! I wonder if the color change will remain or if it will fade. Cool experiment! Fran
|
|
brent
fully equipped rock polisher
Member since November 2008
Posts: 1,316
|
Post by brent on Dec 25, 2011 13:06:10 GMT -5
Yes they did fade. The last one faded in a couple days, and the others that were in the frozen water longer took a week or so. Still intereseting.
|
|