How to define the appearance of stamps?

The following is Zhao Yong's online evaluation of the appearance:

Chinese name: Quanpin

Grade description: The tickets are almost issued, with bright colors and neat perforations. The paper is allowed to have tiny defects such as tiny paper spots and extremely light Microsoft folds. (Slightly yellow, dirty, finger prints, weak teeth, etc. And the back glue is the original glue, which can naturally yellow due to time, but it must be very uniform; Stamp perforation allows light folding, and gold and silver powder stamps are well preserved to allow small oxidation; Before liberation, the original glue was allowed to be lightly attached to the back glue of the ticket. )

Chinese name: top grade

Grade description: the overall feeling of the ticket is perfect, the color is bright, the paper is allowed to have paper spots, faint Microsoft folds and so on. (Slightly yellow, dirty, hairy, white, short teeth, etc. And the back glue is the original glue, allowing yin and yang to be yellow, uneven and folded; Creases are allowed between the perforations of consecutive stamps, but they do not tear and do not affect the stamps themselves. Certificates 1 and 10 can be torn, gold and silver powder stamps are allowed to be slightly oxidized, and stamps are allowed to be labeled; Before liberation, tickets were allowed to turn yellow, partially glued, not glued or glued. )

Chinese name: middle and high grade

Grade description: The overall feeling of the ticket is good, the color is basically bright, the perforation is basically neat, and the paper is allowed to have creases. (yellowing, mildew, partial glue, patch, or no glue, back glue, missing teeth, peeling, cracks, discoloration, fading, etc.). ); Even stamps can be torn, and gold and silver powder stamps are allowed to oxidize. )

Chinese name: China goods.

Grade description: The overall feeling of the ticket is average, with no serious injuries and defects. (On the basis of middle and high grade, the color is allowed to feel older, with a considerable degree of missing teeth, missing corners, tearing, fading, thinning, creases and so on. )

Chinese name: poor quality

Class description: The ticket is disabled or seriously defective. (There are serious missing teeth, missing corners, tearing, fading, peeling, hard folding, breakage, etc. , or the size specifications are obviously different. )

Chinese name: patch

Grade description: tickets that have been repaired manually. (After artificial repair treatment, such as complementary color, scratches, changing the bottom, flat-fell seam, etc. )