(57) A method of forming a black-and-white image of very high contrast having a gamma
value of 8 or above is disclosed, using a negative imagewise exposed photosensitive
material comprising a support having thereon at least one hydrophilic colloid layer,
at least one layer which is a silver halide emulsion layer, at least one of said hydrophilic
colloid layer containing a hydrazine derivative represented by formula (I), comprising
processing the photosensitive material with a developer having a pH of 11.2 or lower,
said developer being substantially free from benzotriazoles to thereby provide a wide
exposure latitude and steady image formability:
 wherein R₁ represents an aliphatic group or an aromatic group; R₂ represents a hydrogen
atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group,
a carbamoyl group or an oxycarbonyl group; G₁ represents a carbonyl group, a sulfonyl
group, a sulfoxy group,
 or an iminomethylene group; and each of A₁ and A₂ represents a hydrogen atom, or
one of A₁ and A₂ is a hydrogen atom and the other is an alkylsulfonyl group, an arylsulfonyl
group, or an acyl group.
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