The first surface of the web includes on selected portions thereof means for forming areas of at least a plurality of {HEAD ~ different colors} comprising {TAIL ~ coatings} of initially colorless color formers and color developers, which, when exposed to heat from a thermal printer, combine to form colored visible areas 
The first surface of the web includes on selected portions thereof means for forming areas of at least a plurality of { HEAD ~ different colors } comprising { TAIL ~ coatings } of initially colorless color formers and color developers , which , when exposed to heat from a thermal printer , combine to form colored visible areas
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