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Tips, Techniques, and Questions -- Technical questions or tips |
2015-07-31, 2:55pm
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Christine
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Join Date: May 16, 2015
Location: Chatham, Illinois
Posts: 272
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Reducing flame, reduction
I am still not clear on what is meant by "reduction" and/or "a reducing flame". (I'm on a hothead.) Can anyone explain in simplest terms, please?
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2015-07-31, 4:31pm
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Senior Moment
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Join Date: Jun 16, 2012
Location: New Yawk
Posts: 4,161
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Sure. A reduction flame is one that's more fuel than oxygen.
With the HotHead you are always running on the fuel rich side, as the vent holes just add a small amount of room air. That's opposed to dual fuel torches, which are made to use an additional oxygen source (like an oxycon) and which you can adjust the flame composition.
A reduction (or fuel rich) flame affects certain glasses as the fuel is looking for O2 to combine with. When there isn't enough, it steals it from the glass, causing a reaction.
Make sense?
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2015-07-31, 5:14pm
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Christine
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Join Date: May 16, 2015
Location: Chatham, Illinois
Posts: 272
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Wow, I got it now. Thank you!
So, do all glasses reduce or just certain glasses, like boro, please? That is, if you deprive them of O2 in the flame?
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2015-07-31, 5:41pm
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da General
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Join Date: Oct 05, 2006
Location: San Francisco
Posts: 13,002
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It's used for reducing silver glass such as those made by Double Helix to bring out the iridescence.
For a HotHead, people rig out some device (e.g., an aluminum "cup" or just wear heat proof glove) to cover the vent holes during the reducing process.
Here is a tutorial De made:
http://www.lampworketc.com/forums/sh...ad.php?t=86417
Here is like an aluminum "cup" but made with thick metal wire:
http://www.wetcanvas.com/forums/showthread.php?t=81961
Hope this helps.
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Hayley
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2015-07-31, 5:48pm
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Senior Moment
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Join Date: Jun 16, 2012
Location: New Yawk
Posts: 4,161
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No, not all glasses reduce; depends on their chemical composition. Some are formulated to be reduced, such as the glasses Hayley discussed above. Others do it because of their chemical make-up; you'll often find many blues made with copper will reduce as the reduction flame brings the copper to the surface.
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2015-07-31, 7:46pm
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Christine
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Join Date: May 16, 2015
Location: Chatham, Illinois
Posts: 272
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Thank you very much to you both!
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2015-08-15, 4:42pm
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Junior Member
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Join Date: May 26, 2014
Location: Upstate NY
Posts: 1
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Thank you Allicat I was wondering the same thing and thank you Hayley that was a very helpful tutorial! I can't wait to try it
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2015-08-27, 11:36am
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Ellyloo-YAH!
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Join Date: Aug 01, 2006
Location: Port Colborne
Posts: 2,775
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I was very confused for a while. I seemed to see a lot of people use "reduce" for different effects.
For instance, if one was talking about getting the desired effect from Raku... sometimes I saw the word 'reduce' used. If you use a propane rich flame with Raku, you get a shiny metal surface, that's for sure, but it's not the desired effect.
What happens with Raku is more "striking" ...where you heat and cool and reheat for a colour to happen.
with some Double helix colours, they do nifty things with both reduction and striking.
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2015-08-27, 3:22pm
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Junior Member
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Join Date: Jun 28, 2015
Location: Suffolk, UK
Posts: 11
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Lovely explanantions, thank-you
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