Liner color

[Ctwoodtick]

with some stove maintenance recently, I took off surround to look at liner. Is this coloration alright? Liner is heavywall. Insulation wrap start about a foot or so up liner from stove.

 

[Corey]

Looks fine to me. You're seeing some 'tempering color' from the steel getting hot - as a flue will obviously do. The color sort of records the highest temperature the steel has experienced. Straw yellow can start around 300-400F with blue showing up in the 500F range. No big deal for stainless pipe. If it turns gray / black you've gone 'out the top end' and temps were over 750-800F still no big deal for the pipe, but might indicate a possible flue fire or stove over-fire has occurred.

https://en.wikipedia.org/wiki/Tempering_(metallurgy)