Discolouration patch on glass

[rosieaboll]

Hello!

I noticed a discoloured patch on the glass. It almost has rainbow tones to its edges. I’m not sure of the correct term for it.

My questions are
- will it just go away?
- if not, how do I remove it (hoping it isn’t permanent)?
- how do I prevent it again?

For context, it only showed up after running the fire for the third time. My partner ran it for a full day and let it go overnight. This morning I have noticed this.
It’s on there left side of the picture but hard to see with reflection.

Thanks

 

[Dix]

Welcome to the Forums from Down Under !!

Yes, it's normal, It's from a fire that didn't burn quite hot enough. Multiple causes.

For a 3rd time burn, not bad. Not great, but not bad.

How seasoned is your firewood, and what type of stove is it?

Again, welcome to the Forums

 

[rosieaboll]

Thanks very much!!
We were told the wood was quite seasoned - that It had been there for a year or two. It is an in built wood fire heater - see attached. Hope that answers it correctly!

Should It come off when we burn again or should I clean it somehow ?
Also, great forum!