Meth pipe has clear for??

[heatherthequeen33]

Hi so I've been smoking meth for years and from time to time not everytime I've noticed after hitting a bubble and it cools there's a perfectly round dot in the middle of the cooled meth does anyone know why it's there or what it is please and ty

 

[Joey]

It could possibly be that since the center of the cooling spot where it’s been heated would be the hottest and the last to cool, it’s a slight burning of your product in that spot. Only thing I can think of, I don’t really know.