A brushed finish has a visible grain. Light can reflect differently along and across that grain, so rotating the same sample can change how bright or dark it looks. Marking the intended direction gives reviewers a repeatable starting point and helps them distinguish a rotated sample from a finish difference.
Keep the light and sample orientation fixed
Put the direction mark on the back or in the sample record. Compare the reference and candidate under the same light with their grains aligned. On a curved part, identify the area and angle being judged. If the visual difference changes when both parts rotate together, record that response rather than selecting whichever angle makes the samples look closest.
Approve what the user will actually see
Specify the grain direction relative to an identifiable feature such as the cap axis or logo. Check the cap and body together if the design depends on their directions matching. If instrumental measurements are required, record the measurement direction separately from the visual setup. A reading across the grain answers a different question from a visual check of the assembled pack.
Packaging sample showroom of SamBound New Material Technology Company Ltd. Company information: sambound.com.
SamBound New Material Technology Company Ltd.
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