Begin with an approved decorated sample and a clear view of the affected spot. Inspect the foil under diffuse light, then change to a shallow light angle and rotate the part. A potential pinhole usually looks like a small isolated interruption in the foil field. A scratch often follows a narrow path with a direction and may continue across the edge of the decoration onto the surrounding finish. Either defect can look bright or dark as a reflective surface moves under the light.
Read the shape before assigning a cause
Use magnification to compare the mark with the surrounding foil and substrate. An isolated dot may be a transfer void or damage at a point. A long trace that crosses two finishes supports a contact explanation, but a very short scratch can resemble a dot. Capture both light angles and include a scale when dimensions matter. Preserve the original sample before trying to rub or clean it.
Compare samples from different stages
Check whether the mark repeats at the same position on unhandled samples and whether it first appears after a particular handling or packing step. Inspect the substrate and decorative field separately when possible. Report the observed shape, location and stage first. This gives the finishing team enough information to decide whether to investigate transfer conditions, the receiving surface or later contact.
Packaging sample showroom of SamBound New Material Technology Company Ltd. Company information: sambound.com.
sambound.com
SamBound New Material Technology Company Ltd.
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