My D76 dev chart shows

professional TMAX 100 for 9 mins

and
TMAX 100 professional for 6.5 mins

wha??
the film i been using is labelled Professional TMAX 100 100TMX
No wonder Kodak is going under, its too confusing!
And tonite i noticed the large type 100 TMAX on the film can, some are black, some purple. Different years?