Abstract A photographic chemical compound in incorporated into a hydrophilic colloid composition by dispersing a solution of the chemical compound in the hydrophilic colloid composition in the presence of a surface active compound of the formula : WHEREIN : N IS 0 OR 1 AND M IS 0 TO 30, R3 is hydrogen or when n is 1 may be alkyl, R2 and R3 stand for straight-chain or branched-chain alkyl groups or together are the atoms necessary to complete an alicyclic ring structure, R1 and R2 comprising at least eight C-atoms, and Z is a group -SO3M, -OSO3M, -OCOXSO3M or -Y-A-SO3M wherein M is hydrogen, alkali metal, ammonium or organic ammonium X is alkylene, aralkylene or arylene, Y is oxygen or sulphur, and A is alkylene or aralkylene. The colloid composition can be a light-sensitive silver halide emulsion or a non-light-sensitive water-permeable colloid composition.
Method according to claim 1, wherein the ratio of photographic chemical compound to surface active compound is from about 10:1 and 1:1.
Claim 2
Dependent Claim
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Method according to claim 1, wherein a solution of the photographic compound and the surface active compound in one or more organic solvents is dispersed in the said hydrophilic colloid coating composition or the said aqueous solution of a water-soluble colloid.
Claim 3
Dependent Claim
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Method according to claim 3, wherein the said solvent is a substantially water-immiscible solvent.
Claim 4
Dependent Claim
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Method according to claim 4, wherein said solvent has a solubility in water of at most 25 percent by weight at room temperature and a boiling point of at most 130*C.
Claim 5
Dependent Claim
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Method according to claim 3, which comprises removing the said organic solvent simultaneously with or subsequently to dispersing the said solution of photographic component into the hydrophilic colloid coating composition or the aqueous solution of water-soluble colloid.
Claim 6
Dependent Claim
29 words
Method according to claim 1, wherein the said photographic chemical compound is a colour former or mask-former and the hydrophilic colloid coating composition is a gelatino silver halide emulsion.