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