Hi Janice, welcome to woodburning with your new stove. I have a catalytic stove but I would never go to 700 degrees stovetop before shutting the air down (even if the cat was already engaged). Perhaps you mean 700 degrees flue temp?
In any case, if your glass is really black at the end of the burn then your moisture content in the wood is still too high and that may be why your dealer told you to run the stove temp up pretty high before shutting it down. Your glass may darken a bit for some of the burn, but most of that should burn off by the end of the burn.
