Thread: Calcedony Prep
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Old 07-30-2017, 08:57 PM
Dan Vanantwerp
Posts: n/a

Thanks for all the help. I feel like I owe it to CW to follow up with my results.

My first attempt was a cobalt mix that failed to produce opal swirls. I am using crystallica and wanted to see if the cullet/squiggles would work without fritting the glass.

I changed things up and made a clear calcedony mix (no cobalt) based on Pete's recipe for calcedony and fritted glass. Huge difference!

I'm loving this glass. My furnace is a custom wire melter in which is housed both my 80 lb crucible and a 17 lb "color" crucible I got from Sundance. I built separate openings for both crucibles. I just dip into the calcedony, pull out the gather and cut the tail with a pair of turning!

As the glass cools the swirls appear...more heat/cool cycles=more color!

I haven't quite got the red to express very well yet. Any advice to expand the color spectrum would be very welcome.

Thanks again to those who have shared their experiences with this color and especially Mr. VanderLaan.
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