Bubbles are the devil?

[Tommyboi]

Hello, I'm using a lot of colors with Moretti glass. I have found that some of the colors come out great, but alot of colors (transluent colors) are bubbling when I heat them up and apply them to the mandrel. Can you give me any tips to tell me how to resolve this issue. Thanks :bangHead:

[mer]

try a bushier flame and work out at the back of it. also warm the glass really slowly before you start working it in the flame.

[Tommyboi]

k, and what would a bushier flame be?

[mer]

softer, less force. more fuel, less oxygen. unless you're on a hothead or something, then i don't know what to tell you.

[Chris Juedemann]

Would white happen to be involved? That's a good indicator of your mix. If it browns up at all, along with bubbles, you need more oxy, and/or less propane. If it just bubbles, more propane, and/or less oxy.

Like Mer said, work it a lot further from the torch than boro.

What kind of torch?

[Tommyboi]

im workin on a standard minor. ty for the tips.

[richsantaclaus]

Ocactionally bubbles might come from the dipped mandrel not being dry before you add heat.

[2scoops]

Ditch moretti, best advise out there. Seriously though, moretti can be tough to work, definately work further out in the flame and know the colors you are working with, flame atmosphere is essential no matter what kind of glass you work with, especially when it comes to color. Also, I dont know how much you know, so I dont want to insult your intelegence, but read up on flame atmosphere, it all has to do with the way the gas is mixed, lots of propane and a little oxy = reducing, equal oxy and propane = neutral, lots of oxy and a little propane = oxidizing. Hope that helps. You should be able to get a listing of what colors like as far as flame atmosphere, and when in doubt, ask here.

-Scoops

[menty666]

I hear tell that moretti needs lower pressures too than used for boro. Had that problem myself.

So for example if you're using 5/15 for boro, try 3/10 for moretti. And avoid the alabaster colors. I'm gonna go start swearing under my breath now over that last part.