Clarity and Aether compatibilities

[demcc2]

Oh wait...I don't mean are they compatible with eachother! I recently made a few small marbles and two have had small surface cracks....one of them chipped off along the crack. They have been annealed properly as well.
One of the marbles that had a crack was the clear against effetre dark red, the other, that cracked and chipped was effetre dark lapis cobalt.

Thanks in advance.

Duane

[Reenie]

Duane,
It doesn't matter what clear I use but it always cracks over dark red. Hoping it's not just me but that's been my experience :-(

[lilacwind]

Duane,
I spoke to a bead maker this weekend who said she would never encase red... I hardly ever use red, so that is not my problem. My problem recently is using aether over Kiwi. My beads have been larger that usual, but I feel my annealing, and hold schedule is ok. Has anyone had trouble with aether over Kiwi?The crack goes hole to hole, but I have been told that is "not always an annealing problem" There are other Effetre colors between the Kiwi and Aether, which vary from bead to bead...the constants being Kiwi and Aether.
Any ideas?
Mimi

[Jody Lee]

My first batch of Kiwi I could encase with anything.. the stuff I got around 8-10 months ago, cracks right up the mandrel. I was using dichro too, but even without it, it was cracking.

[Hayley]

Try doing the "sandwich" technique the boro peeps do - start with a core of clear (Effetre is fine), encase with the finicky color, then encase in Aether - hope that will help!

[demcc2]

thanks for the tips, but I'm not encasing... I'm using the clear for marbles

Duane

[Elizabeth Beads]

Aether seems to play nicely with CiM Sangre for me. I've had really good luck with Clarity and silver glass. Could your cracks be thermal? A picture might help, since you say you aren't encasing.

[Judith Billig]

Aether seems to play nicely with CiM Sangre for me. I've had really good luck with Clarity and silver glass. Could your cracks be thermal? A picture might help, since you say you aren't encasing.

I made the same experience: CIM Sangre with either Aether or Effetre Super Clear works without any problems (didn't try it with other clears).

[Hayley]

Duane - sorry about not seeing that you are making marble. Sometimes hot colors are more finicky encased (in marble, surrounded by lots of clear! :) ) . . . When I took Loren Stump's butterfly murrini class, he cautions us on using hot colors (reds, oranges, yellows) for our murrini for it varies from batch to batch and the cracks don't show up until everything is clear encased four days later! Two of the butterfly murrinis made in our class did crack - one with yellow and the other with red!

Also there were a couple of posts a while back that someone did have trouble with using Aether in marble. Let me see if I can find it for you.

ETA:
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Perhaps you can email Jed at Double Helix and ask if he has any recommendations?

[Double Helix Glassworks]

234446
This chart shows strain data collected during tests during which a single manufacturer's colors were tested against their own clear. The purpose of these tests was for us to determine the general range of expansions within each manufacturer's line of glass. No company names or product numbers are listed, but the glasses are displayed from left to right in numerical order based on their stock number. (xxx004 - xxx999). Falling about in the the middle of the chart are the "specials", cadmium colors with stock numbers in the "xxx400"'s. You will note very high strain levels between these colors and the clears made by the same factory. When we examine the raw data, we found that certain colors in that color group had strain levels far outside of "safe" parameters. In fact, some of the samples are absent from the chart, as the fused samples shattered upon cooling, which gave us a (false) net strain reading of "0", as the strain was relieved by the breakage. This data would tend to support the anecdotal reports regarding certain colors' suitability to deep encasement. To view links or images in this forum your post count must be 1 or greater. You currently have 0 posts.'s%20Perspective%20on%20Compatibil ity.pdf

Jed at Double Helix

(technical note : Negative psi numbers indicate that the color tested "softer", or higher expansion, than the control clear. Generally 1000 psi total strain is considered the maximum "safe" level before breakage from internal strain. The tests we performed are indicative only of the particular lot or batch of glass that we tested at that time.)