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The Topps hockey cards were printed on slightly different stock or cardboard. Topps generally had darker colours on the backs. The Topps cards were also prone to, what I call, the 'Topps stain'. Greasy finger marks stood out quite prominent and permanent on the rear of Topps note cards. The fronts of the Topps cards was in fact more glossy than their cousin's plastic. I've done a involving experimenting a problem system we discovered that it could give quite decent translations, but only if you write correctly the actual world source