In {TAIL ~ an alternative embodiment}, the coatings of {HEAD ~ color formers} and color developers are self contained coatings having pressure rupturable microcapsules containing either the color formers or said color developers 
In { TAIL ~ an alternative embodiment } , the coatings of { HEAD ~ color formers } and color developers are self contained coatings having pressure rupturable microcapsules containing either the color formers or said color developers
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH