$2\mathrm{.}2\mathrm{.}2.(10$ prs$)$ Product quality assurance $($QA$)$ is a particularly tricky husiness in the dyc manufacturing industry. A slight variation in reacton conditions can lead to a measurable change in the color of the product. and since cuslomers usually requife extremely high color repreducibility from one shipment to another. even a small color change can lead to rejection of a product batch.

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