If the polyester unknown and polyester reference differ noticeably in the 870–725 cm⁻¹ region, they cannot possibly be from the same polymer class.

Which table best supports a decision to re-dilute and re-run?

The most defensible reason to choose 357.869 nm over 425.433 nm is:

Which acceptance criterion is most directly tied to “drift/carryover”?

Which is the best reason to avoid boiling during nitric digestion?

Which combination of techniques would provide the strongest overall forensic comparison for a colored polyester garment?

If the CCV recovery is 78%, the best next step is:

The ________ process can create fibers in different shapes, lengths, and colors.

Unknown 2’s spectrum is essentially identical to cotton reference, so the proper forensic conclusion is that it is the same garment as the cotton reference.

Which region is most useful for distinguishing cotton from wool quickly?