A multi-layer article comprising: a first, interior, thermally activatable layer, wherein the first thermally activatable layer comprises a first light to heat convertor composition and a first color changing compound, and wherein the light to heat convertor composition absorbs light of a first write wavelength and the first activatable layer has a first absorption threshold for activation; a second, interior, thermally activatable layer, wherein the second thermally activatable layer comprises a second light to heat convertor composition and a second color changing compound and wherein the light to heat convertor composition absorbs light of the first write wavelength and the second activatable layer has a second absorption threshold for activation, wherein the second absorption threshold is lower than the first absorption threshold; and a first blocking layer disposed between the first and second internal thermally activatable layers, the first blocking layer being adapted to at least partially block light of the first write wavelength; and a third, interior, thermally activatable layer, wherein the third thermally activatable layer comprises a third light to heat convertor composition and a third color changing compound, and wherein the third light to heat convertor composition absorbs light of a second write wavelength and the third activatable layer has a third absorption threshold for activation; a fourth, interior, thermally activatable layer, wherein the fourth thermally activatable layer comprises a fourth light to heat convertor composition and a fourth color changing compound and wherein the fourth light to heat convertor composition absorbs light of the second write wavelength and the fourth activatable layer has a fourth absorption threshold for activation, wherein the fourth absorption threshold is lower than the third absorption threshold; and a second blocking layer disposed between the third and fourth internal thermally activatable layers, the second blocking layer being adapted to at least partially block light of the second write wavelength. a first, interior, thermally activatable layer, wherein the first thermally activatable layer comprises a first light to heat convertor composition and a first color changing compound, and wherein the light to heat convertor composition absorbs light of a first write wavelength and the first activatable layer has a first absorption threshold for activation; a second, interior, thermally activatable layer, wherein the second thermally activatable layer comprises a second light to heat convertor composition and a second color changing compound and wherein the light to heat convertor composition absorbs light of the first write wavelength and the second activatable layer has a second absorption threshold for activation, wherein the second absorption threshold is lower than the first absorption threshold; and a first blocking layer disposed between the first and second internal thermally activatable layers, the first blocking layer being adapted to at least partially block light of the first write wavelength; and a third, interior, thermally activatable layer, wherein the third thermally activatable layer comprises a third light to heat convertor composition and a third color changing compound, and wherein the third light to heat convertor composition absorbs light of a second write wavelength and the third activatable layer has a third absorption threshold for activation; a fourth, interior, thermally activatable layer, wherein the fourth thermally activatable layer comprises a fourth light to heat convertor composition and a fourth color changing compound and wherein the fourth light to heat convertor composition absorbs light of the second write wavelength and the fourth activatable layer has a fourth absorption threshold for activation, wherein the fourth absorption threshold is lower than the third absorption threshold; and a second blocking layer disposed between the third and fourth internal thermally activatable layers, the second blocking layer being adapted to at least partially block light of the second write wavelength.