补胶——有的邮票因保管不妥,发霉或出现黑点、黄斑,于是有好事者将它先洗胶再上乳胶,次品变上品。仔细观察不难发现,因为补胶难以均匀,在齿孔边甚或有沉淀。 补厚度——有些旧票,是从信封上撕下来的,邮票撕薄了,有人将它重新上胶,增加厚度,所以购信销票 Plastic - some stamps due to improper storage, moldy or black spots, macular, so there are people who will wash it first and then latex, defective goods become top grade. Careful observation is not difficult to find, because the glue is difficult to even, even in the perforation edge precipitation. Make up the thickness - some old tickets, is torn off from the envelope, the stamp ripped thin, someone glue it again to increase the thickness, so buy tickets