The first surface of the web includes on {TAIL ~ selected portions} thereof {HEAD ~ means} for forming 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 
on
The first surface of the web includes on { TAIL ~ selected portions } thereof { HEAD ~ means } for forming 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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