: Use a square piece of white paper (typically 15x15 cm or 21x21 cm).
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If you were looking for technical standards related to paper or similar materials, you might be interested in: : Use a square piece of white paper
: Covers binding materials on a paper base (used for book covers). GOST 3441-88 : For electrical insulating impregnated paper . GOST 8942-85 : For paper tape used in printing devices. gost 23345 84