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When it is necessary to protect a sample from light, the Whirl-Pak black bag is specially designed for this application. The polyethylene film is made from pigmented resins so… [Read more] the black color is an integral part of the bag and not a printed layer. FDA approved for food contact. Film thickness is 2.5 mil (0.064mm). 4-oz and 18 oz. available. 500/box.
