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Type of paper

A special grade of paper having a surface design or hidden warning indicia or both of such chemical composition as to make obvious and attempt at fraudulent alteration 'of the writing thereon by ink eradicators, mechanical erasure, etc. It is used for bank chueque, coupons, money orders, lottery tickets, trading stamps, transportation tickets and other paper items having a negotiable value. Safety paper is made by either a wet or dry process. In the wet process the surface design is applied to the paper by immersing it in a dye bath and than removing the dye solution usually by passing the paper through a press"comprising one steel engraved pattern roll and a rubber compostion backing roll Wet process safety papers have a positive surface pattern on one side and a reverse pattern on the other. Such papers must be dried after processing. In the dry process the surface design and warning indicia, if any are applied- by a flexographic press employing spirit-soluble inks or dyes. Dry process safety papers can be produced with positive-reading patterns on both sides of the sheets, with positive , and negative patterns on the top and bottom of the sheet, or with multicolour or multi-pattern combinations of the two. Dry process safety papers, require little or no drying during conversion because of the fact that alcohol instead of water is the principal ink (i.e. dye) solvent.

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