TECHNOLOGY FOCUS - POLYMERS - Preferred Conductive Polymers: (II) contain at least one repeating unit selected from:(1) anilines of formula -Ph'-NH-Ph'-;(2) pyrroles of formula -Pyr- (in which R2 = H) or -Pyr-Pyr;(3) thiophenes of formula -Thi-Thi-, -Thi- or -Thi-Z-;(4) furans of formula -Fur-;(5) diphenyl sulfides of formula Ph'-S-Ph'-;(6) p-phenylene-vinylenes of formula -Ph''-trans-CH=CH-;(7) indoles of formula -Ind-;(8) aromatic amides of formula -NH-Ph'''-CO-, -NH-Ph'''-X-Ph'''-CO-, -Ph'''-NHCO-Ph'''-CO- or -NH-p-C6H4-p-C6H4-X-p-C6H4-NHCO-p-C6H4-CO-;(9) aromatic hydrazides of formula -NHNH-Ph'''-CONHNH-, -NHNHCO-Ph'''-CONHNHCO-Ph'''-CO- or -NHNHCO-(pyridine-2,5-diyl)-CONHNH-;(10) aromatic azomethines of formula Ph'''-N=CH-, -Ph'''-N=CH-Ar-CH=N- or -Ar-N=CH-Ph'''-CH=N-; or(11) aromatic esters of formula -O-Ph'''-CO-, -O-Ph'''-X-Ph'''-CO- or -O-Ph'''-O-CO-Ph'''-CO-.Ph1 = 1,4-phenylene, substituted by R1 - R4;Pyr = pyrrole-2,5-diyl, C-substituted by R1 and R2;Thi = thiophene-2,5-diyl, substituted by R1 and R2;Fur = furan-2,5-diyl, substituted by R2;Ph'' = 2-(R1)-5-(R2)-1,4-phenylene;Ind = 4-(R1)-7-(R2)-indole-1,3-diyl;Ph''' = 1,4-phenylene, substituted by R;R, R1 - R4 = R', OR', COOR', OCOR', halo, NO2, CN, cyanoalkyl or solubilizing group (preferably selected from COOH, COOM, SO3H, SO3M, primary, secondary or tertiary amino, quaternary ammonium, OH or poly-(2-3C) alkylene oxide; and optionally bonded via a spacer group such as -R''-, -OR''-, -OCOR''- or -COOR''-), provided that at least one is a solubilizing group;R' = 1-20C alkyl;Ar = group containing a mono- or polyaromatic residue;X = NHCO, O, S, SO2, N=N, C(Me)2, CH2, CH=CH or CH=N;Z = CH=CH or CC;M = alkali(ne earth) metal, amine, alkanolamine or aminoacid;R'' = 1-20C alkylene, optionally containing heteroatom(s).In particular (II) contains thiophene repeating units as defined above, in which one substituent is a carboxy-type solubilizing group (optionally bonded via a spacer, specifically 1-20C alkylene) and the other substituents are H.Preferred Composition: (A) contains (I) (preferably selected from 3-5C hydrocarbons, fluorinated or chlorinated hydrocarbons, carbon dioxide, nitrous oxide, dimethyl ether, nitrogen and compressed air) at 5-90 (preferably 10-60) wt. % and (II) at 0.001-50 (preferably 0.1-10) wt. %. The medium consists of water, optionally mixed with a solvent (specifically selected from alcohols, glycols, glycol ethers, polyols, polyol ethers, polyethylene glycols and/or polypropylene glycols; preferably at least 50 (especially at least 70) wt. % consisting of 2-4C alcohols). (A) optionally also contains at least one direct dye (preferably selected from nonionic, cationic or anionic direct dyes), specifically at 0.0005-12 wt. %. EXAMPLE - Poly-(thiophene-3-acetic acid) (IIa) was prepared by stirring a mixture of 25 g ethyl thiophene-3-acetate, 1 g ferric chloride and 25 ml chloroform under argon at 50 degreesC for 24 hours, precipitating the obtained poly-(ethyl thiophene-3-acetate) with heptane, treating a solution of 2 g of the product in 30 g tetrahydrofuran (THF) with an equimolar amount (based on the carboxy groups) of sodium hydroxide, adding 30 g of water and evaporating the THF, giving a 6 % aqueous solution of the sodium salt of (IIa). An aerosol container was charged with 1 g (IIa), aminomethyl propanol to give pH 7, water to 50 g, 15 g ethanol and 35 g dimethyl ether. The composition was sprayed from ca. 20 cm away onto hair for ca. 5 seconds to provide a brightening effect.