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Dark circle under burner flame


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Right where the burner flame hits the refractory/forge liner, there’s a dark circle about an inch or two in diameter. Outside of that circle, everything is red/orange but within that circle it is a noticeably darker grayish blacker color. When i fiddle with the air or gas the circle either shrinks or expands and may get darker or disappear as it becomes the same color as the surrounding material. 
 

should i be trying to get that dark spot? Or should i try to get it red, like the rest of the forge? What is causing this?

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That sounds like uncombusted fuel or oxygen is cooling the wall of the forge slightly.  Does the dark spot go away when you have your flame adjusted to a neutral setting?

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1 hour ago, Brian Dougherty said:

That sounds like uncombusted fuel or oxygen is cooling the wall of the forge slightly.  Does the dark spot go away when you have your flame adjusted to a neutral setting?

I’m still figuring out the neutral settings but yes.. as i close off the air, the dark spot gets smaller and smaller and then goes away until the forge is one uniform color. I just wasn’t sure if this is what i should have been shooting for , or if that dark circle was normal. As the air gets chocked off and the dark circle goes away the sound of the forge goes from a roaring sound to a more mellow sound.. and I’d thought this meant that it was getting less hot .. i have no real reason for thinking that other than the loud roar must be better right ..lol. I know better now.  When i fire it up again I’ll adjust it accordingly. I’ve got a k type thermocouple arriving in a couple weeks so that should also help in matching the color sound and heat temps. Thanks!

39 minutes ago, Alan Longmire said:

Too strong a blast.  Turn down the air and gas accordingly.

Yes.. i remember that as fiddles with it and the blast got softer, the spot blended into a red/orange.. just wasn’t sure if this is what i wanted. The flames out the front should be licking up, correct?.. rather than blasting out like the backside of a jet engine? 

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