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