Disclosed are oxazine disulfide dyes of formula (1) D1-(Z1)r-Y1—S-A, wherein A is hydrogen; or a radical of formula (1a)*—S—Y2-(Z2)r-D2; Y1 and Y2 independently from each other are unsubstituted or substituted, straight-chain or branched, interrupted or uninterrupted C—1—C—10alkylene; C5-C10cycloalkylene; C5-C10arylene; or —C5-C10arylene-(C1-C10alkylene); Z1 and Z2 independently from each other are *—(CH2)p—C(O)—**; *—(CH2CH2—O)S—**; *—(CH2)p—C(O)O—**; *—(CH2)p—OCO—**; *—(CH2)P—N(R1)—**; formula 1(g); —(CH2)p—CON(R1)—**; *—(CH2)p—(R1)NC(O)—**; , 0-; —S—; —S(O)—; —S(O)2—; or a cationic biradical of a substituted or unsubstituted aromatic or heteroaromatic compound of the formula (1a); (1b); (1c); (1d); or (1e); wherein the asterix * indicates the linkage to D1 and/or D2; the asterix ** indicates the linkage to Y1 and/or Y2; W1 is N or a radical of CR5; R1, R2, R3, R4 and R5 independently from each other are hydrogen; C1-C14alkyl; C2-C14alkenyl; C5-C10aryl; C5-C10aryl-(C1-C10alkyl); or —C1-C10alkyl(C5-C10aryl); D1 and D2 independently from each other ar the residue of an organic dye selected from the radical of formula (1f); R6 and R7 independently from each other are hydrogen; C1-C20alkyl; C1-C20alkoxy; C3-C6cycloalkyl; C5-C10aryl; anellated aromatic groups; carboxylate; or sulfonate groups; R8, R9 and R10, R11 and R12 each independently from each other are hydrogen; unsubstituted or substituted, straight-chain or branched, monocyclic or polycyclic, interrupted or uninterrupted C1-C14alkyl, C2-C14alkenyl, C6-C10aryl, C6-C10aryl-C1-C10alkyl or C5-C10alkyl(C5-C10aryl); or R8 and R9 or R10 and R11, together with the linking nitrogen atom form a 5 to 7 membered carbocyclic ring which may contain one or more than one hetero atom; or R8 is linked to C1 together with N+ forming a 5-7 membered carbocyclic ring; or R9 is linked to C2 together with N+ forming a 5-7 membered carbocyclic ring; X is —O—; or —N(R9)—; or —S—; p is a number from 0 to 5; r is 0 or 1; and s is a number from 1 to 5. The compounds are useful for the dyeing of organic materials, such as keratin fibers, preferably human hair.