Color problems, Might be clear problems

Just wanted to drop a quick post about a recent problem and observation Ive had... I have been using these colors for years, most since theyve come out:
Alchemys Neptune sparkle, bronze sparke, Jupiter, euromax cobalt, and a couple of others, but those are the main ones Im talking about. I have never had problems with those colors, NEVER.... I always use either Simax or Kimble tubing but just recently got a case of Pyrex and about 1/3 of everything I make with those colors in Pyrex (Inside out work) have checked and cracked like the old days.. really sucks b/c I send out about 50 pieces that looked fine and then got a call a few days later that a bunch of them were checked and cracked. I thought it was the color, but Ive been using the same stuff for so long with no prob., then I realized I just started using that Pyrex. Anyone else happen to notice this. Im just glad I dont have to take those colors out of my line, I really like them:chilling:

I have only used pyrex once, but heard that its made in china now. Not that the chinese make crap (walmart) but it might have affected the quality with the move.

i used to use pyrex w/o problem but i think they've since changed ownership, maybe they changed the glass. did anything else change beside the clear? maybe the kiln?

I quite useing corning because there quality went to shit it the past 5 years not only with compatability but I got a whole case of tube's with air bubble line 's down the whole tube .so every piece I made had a big airbubble I had to pop and fill back in with clear .I switch to Kimble and I love it .Aspecially because it is made in the U.S.A. And I try to always use american made stock . The only thing I use that is imported is colored tubing.Corning is imported and I think that is why the quality went down hill .