Glossy Rim of Chamber

Good afternoon all,
I've noticed a glossiness at the top of the chamber of the two briar pipes I smoke the most. Nothing on the bowl, just the upper part of the chamber furthest away from the shank. I'm sure its from the flames of my zippo, old boy and matches, because I make sure the baccy is well charred before my first light. But my questions are:

a) Is it a normal occurrence?

b) Is this considered damage to the chamber?
Some of my smoking habits:

- I smoke about a bowl a week. Big pipes, a bowl lasts over an hr.

- I make sure that the flame isn't near the chamber for more than 3 seconds at a time while charring and lighting.

- Average # of relights after char and first light, 1.

- I don't smoke when it's windy.

- I give them a quick once over with a pipe cleaner about 4hrs after finishing a bowl, then again 2 days and 4 days after.
Thank you in advance for your response! ::

Thank you for the info mso!

For some odd reason I seem to have more control over the flame on my old boy than I do with any match I've tried. I agree that the flame from a match is the softest of them all. I just seem to have no control of it once the flame is 1/4 of the way down the stick and beyond. The flame just gets bigger and wider on me to the point that it is bigger than the chamber I am trying to get it into. I've even burned a little part on top of the bowl of one of my most expensive pipes while charring because the flame of a match was too big. I'll keep trying though. ::

Great info sablebrush52! Thank you! :D