A photograph cannot reliably preserve every surface detail. Add a short description of the blank before testing: visible coating, texture, prior cleaning, scratches, and any source label you can confirm. Keep observations literal and avoid guessing at an unknown composition.
Use the same lighting and camera position for the before-and-after views. If two blanks arrived under the same product name but look different, record them separately rather than combining their results.
This record supports better questions; it does not establish a guarantee for a whole material category. Find more sample-documentation practices in /updates/.
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