[Ol' Bob]

It's certainly possible that varied pigments mixed into batches of raw plastic could affect cures. The pigments are chemicals too. A red disc has a different recipe than a blue one. I doubt that even weight differences are all that planned. How hot is the mold? ...at the start of the run? ...at the end? How long are the discs left in the mold? There must be a bizzillion variables.

It does happen to be my opinion that Innova isn't extremely anal about these details. Just pop 'em out and have some flunky weigh them and write the model run's innitials and grams. If the interior volume of the mold is the same for varied weights, the density of the discs must be different. This in itself must affect the crossections and rates and amounts of shrinkage on cool-down.

Many paint pigments are metals based. I assume the same is true for plastics. The idea that the different pigments would not affect would be the tougher idea to embrace. It would come down to the question of how great are the variances.