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Hello, Thany you all for this terrific thread. I believe we have more doubts now, which is healthy. Doubt is better than ignorance, isn't it?. So far, we positively know that Silicon Carbide produces some noticeable reaction on glass when fusing and that Aluminium Oxide does not. We know that sandwi...

Hello friends, I have found this paragraph in a site which would be of use: "What causes black bubbles in glass?" "Bubbles with black insides are carbon or graphite. They would be from sawdust or small wood chips getting trapped in the hot glass. As they burned, a gas was released cau...

Jo, Your experience leads me to think Ron is on the track, because you had haze problems only when firing blasted side to blasted side. Quote from Ron's post: "Normally carbon would burn off in the kiln if the blasted surface was exposed to air, but in this application the blasted surfaces are ...

Ron, Your thesis has a lot of sense to me. In respect of cleaning, I believe it will be really difficult to eliminate all carbon particles because they may be actually incrusted into the glass surface, like thousand of minute bullets. By the other side, it would be interesting to use this "prob...

My two cents, In a past life, when I was involved with stainless steel (AISI 304 - AISI 316) recipients manufacturing, we had to use alumina grinder wheels instead of silicon carbide ones for this last contaminated the SS with carbon then lessening the inox properties. Since irid is a thin metallic ...

Another thing U could look at is titanium dioxide

Again very high melt temps

I do have some further ideas if U R on the quest 4 the elusive holly grail of

Mirror Wash tm

Hello Brian,

Thank you for the Ti tip. As you know, I am just the Patagonia chairman of the HGSS - Holly Grail Seekers Society.

Zircon flour is used in face coats by some bronze casters..so why not glass?? the cost could be a factor?? ... around five times the price of alumna hyd.. Colin Hello! I was looking into the matter and have found some information which I would like to share, for what it’s worth. Hydrated Alumina ...

Bert and Tony, Thank you a lot. When I fired natural mica (Muscovite Mica), the one which is used in some appliances like old irons, I have found that my particular micas went through a calcining transformation around 1450°F (800°C). So, I wonder whether you have to first cure micas when used as a...

Separators-comprehensive thread Hello friends, I thought that a post on separators would be useful to me and to all whom, like me, are a bit confused about the substances which are considered as separators. Despite my relatively long permanency in the warmglass arena, I remain doubtful with regard t...