TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Particles: The semiconductor microparticles are titanium oxide microparticles.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation method is given. Preferred Compound: The 5-18C aliphatic group in the dye is a branched alkyl group. Preferred Definitions:    Q=benzene ring;    R,R'=5-18C aliphatic group;    P1,P2=group of formula (i or ii);    V1=H or substituent, preferably H, 5-carboxy, 5-sulfonic acid group, 5-methyl group or condensed 4,5-benzene ring;    n=0-4;    Y'=S, NR9, or CR10R11, preferably S, NCH3, or C(CH3)2;    R9,R10,R11=H, aliphatic group, aromatic group, or heterocyclic group bonded with carbon atom, preferably 5-18C aliphatic group;    R10+R11=ring;    X1,X2=S, O or C(CH3)2;and    Z=aliphatic group, aromatic group, or heterocyclic group (all optionally substituted) bonded with carbon atom.    When n is 2 or more, each V1 is combined with each other to form a ring.    SPECIFIC COMPOUNDS - 71 Aliphatic group-containing dye compounds are disclosed, e.g. 2-(5-(6,10-dipentyl-11-(5-(3-pentyl-2,3-dihydro-1,3-benzothiazol-3-ium-2-ylidene)penta-1,3-dien-1-yl)-4,12-dithia-6,10-diazatricyclo(7.3.0.03,7)dodeca-1,3(7),8-trien-5-ylidene)penta-1,3-dien-1-yl)-3-pentyl-1,3-benzothiazol-3-ium iodide of formula (Ia), 5-carboxy-1-(2-carboxyethyl)-2-(5-(6-(5-(1-(2-carboxyethyl)-3-ethyl-3H-indol-1-ium-2-yl)penta-2,4-dien-1-ylidene)-3,5-diethyl-1,7-dioctyl-1H,2H,3H,5H,6H,7H-pyrrolo(3,2-f)indol-2-yl)penta-2,4-dien-1-ylidene)-3-ethyl-3H-indol-1-ium chloride, 5-carboxy-2-(5-(11-(5-(5-carboxy-3-decyl-1,3-benzothiazol-3-ium-2-yl)penta-2,4-dien-1-ylidene)-6,10-bis(decyl)-4,12-dithia-6,10-diazatricyclo(7.3.0.03,7)dodeca-1(9),2,7-trien-5-yl)penta-2,4-dien-1-ylidene)-3-decyl-1,3-benzothiazol-3-ium iodide, 6-carboxy-2-(5-(6-(5-(6-carboxy-3-ethyl-1-octadecyl-3H-indol-1-ium-2-yl)penta-2,4-dien-1-ylidene)-3,5-diethyl-1,7-dioctadecyl-1H,2H,3H,5H,6H,7H-pyrrolo(3,2-f)indol-2-yl)penta-2,4-dien-1-ylidene)-3-ethyl-1-heptadecyl-3H-indol-1-ium iodide and 5-carboxy-2-((2-oxido-4-oxo-3-((1,3,5,7-tetraethyl-6-((2-oxido-4-oxo-3-((3-pentyl-1,3-benzothiazol-3-ium-2-yl)methylidene)cyclobut-1-en-1-yl)methylidene)-1H,2H,3H,5H,6H,7H-pyrrolo(3,2-f)indol-2-ylidene)methyl)cyclobut-2-en-1-ylidene)methyl)-3-pentyl-1,3-benzothiazol-3-ium.    EXAMPLE - (1,5-bis(decyl)-3,3,7,7-tetramethyl-6-methylidene-1H,2H,3H,5H,6H,7H-pyrrolo(2,3-f)indol-1-ium-2-ylidene)methyl-2-(oxido-4-oxocyclobut-2-en-1-ylidene)methyl-5-decyl-3,3-dimethyl-5-azatricyclo(7.4.0.02,6)trideca-1,4,6,8,10,12-hexaen-5-ium (0.45 g) and 2-((2-hydroxy-3,4-dioxocyclobut-1-en-1-yl)methylidene)-1,3,3-trimethyl-2,3-dihydro-1H-indole-5-carboxylic acid (0.26 g) were mixed in a mixed solvent of 1-butanol (10 ml) and toluene (10 ml), and heated at 100 degrees C for 4 hours. The obtained crystals were filter-separated, and purified by silica gel column chromatography to obtain dye (0.26 g).