Patent ID: 8502848

Claim:
A thermal imaging member comprising: (a) a substrate comprising first and second opposed surfaces; (b) a first oxygen barrier layer carried by one of said first and second surfaces; (c) a first color-forming layer having an activating temperature of at least about 70° C. overlying said oxygen barrier layer; (d) a first spacer layer or layers overlying said first color-forming layer; (e) a second color-forming layer overlying said first spacer layer or layers, having an activating temperature at least about 30° C. above the activating temperature of said first color-forming layer; (f) a second spacer layer or layers overlying said second color-forming layer; (g) a third color-forming layer overlying said second spacer layer or layers, said third color-forming layer having an activating temperature at least about 30° C. above the activating temperature of said second color-forming layer; (h) a second oxygen barrier layer overlying said third color-forming layer; and (i) an overcoat layer overlying said second oxygen barrier layer.