Computer Colour Matching Questions and Answers

Answer: A

Correct answer: A-2, B-4, C-1, D-3

A predicted recipe is judged on four separate grounds. Cost concerns the price of the colourants; the metamerism index concerns how the match will hold up under other lights; fastness concerns whether the dyeing will survive light and washing in use; and process suitability concerns whether the chosen dyes exhaust and build compatibly in the same bath.

Answer: B

Both are true and the reason gives the competing considerations, and cost is only one of them. A cheap recipe that fails in service costs far more in the end. Cost is only one of several criteria. A failure in service costs far more.

Answer: C

Dyes exhausting at different rates cause shade change during the dyeing. Selecting a compatible trichromat is standard practice for this reason. Uneven exhaustion causes shade change during dyeing. A compatible trichromat avoids the problem.

Answer: D

Both are true and the reason gives the reason, and shade change during dyeing is otherwise difficult to control. Reproducibility matters more than a marginally cheaper recipe. Compatibility is worth paying a little for.

Answer: A

The measured batch and the standard together determine the addition required. It is among the most commercially valuable functions the software offers. Rescued material is money directly saved. Correction is the most valuable function of all.

Answer: B

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason gives the mechanism. A failed batch must otherwise be stripped, redyed or sold off, and the cost of that dwarfs the price of the dye in an initial recipe. Correction takes a batch already dyed and computes the small addition that brings it to standard, which is why the payback on a matching system usually comes from correction rather than prediction.

Answer: C

Correct answer: 1 and 2 only

Statements 1 and 2 describe the operation: the batch is measured after the first dyeing and the software computes an addition to the existing dyeing rather than a fresh recipe. Statement 3 is the limitation that governs practice - dye can be added but not removed, so a batch already too dark cannot be corrected this way and must be stripped or reprocessed.

Answer: D

Both are true and the reason gives the asymmetry, and stripping is damaging and expensive. Aiming slightly light on the first dyeing is standard practice. Stripping is damaging and expensive. Aiming light on the first dyeing is standard.

Answer: A

Correct answer: a light batch can be corrected by addition but a dark one cannot

The asymmetry is entirely practical. Aiming a little light leaves room to add dye and reach the standard in a second stage, whereas overshooting requires stripping the shade and starting again. The habit costs a small amount of extra time on most batches and avoids a large loss on a few.

Answer: B

Correct answer: good enough to require only a small correction in most cases

A well-maintained system gets close on the first attempt but rarely exactly right, since dye lot strength, substrate variation and process conditions all shift the result slightly. The realistic expectation is a small correction, which is why the correction facility matters as much as the prediction itself.