The present invention provides an IR-absorbing naphthalocyanine dye of formula (I): ##STR00001## wherein M is selected from Si(A.sup.1)(A.sup.2), Ge(A.sup.1)(A.sup.2), Ga(A.sup.1), Mg, Al(A.sup.1), TiO, Ti(A.sup.1)(A.sup.2), ZrO, Zr(A.sup.1)(A.sup.2), Vo, V(A.sup.1)(A.sup.2), Mn, Mn(A.sup.1), Fe, Fe(A.sup.1), Co, Ni, Cu, Zn, Sn, Sn(A.sup.1)(A.sup.2), Pb, Pb(A.sup.1)(A.sup.2), Pd and Pt; A.sup.1 and A.sup.2 are axial ligands, which may be the same or different, and are selected from --OH, halogen, --OR.sup.3, a hydrophilic ligand and/or a ligand suitable for reducing cofacial interactions; R.sup.1 and R.sup.2 are selected from H or C.sub.1-12alkoxy; R.sup.3 is selected from C.sub.1-12alkyl, C.sub.5-12aryl, C.sub.5-12arylalkyl or Si(R.sup.x)(R.sup.y)(R.sup.z); and R.sup.x, R.sup.y and R.sup.z may be the same or different and are selected from C.sub.1-12alkyl, C.sub.5-12aryl, C.sub.5-12arylalkyl, C.sub.1-12 alkoxy, C.sub.5-12aryloxy or C.sub.5-12arylalkoxy; W is a hydrophilic group; n1 is 0, 1, 2 or 3; n2 is 0, 1, 2 or 3; n3 is 0, 1, 2 or 3; n4 is 0, 1, 2 or 3; provided that at least one of n1, n2, n3 or n4 is greater than 0. Dyes of this type are especially suitable for use in netpage and Hyperlabel systems.

 
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