Fogged, direct positive silver halide emulsion containing a nitro-substituted fluorene desensitizer

A fogged silver halide photographic emulsion for direct positives, containing 1 .times. 10.sup..sup.-5 to 5 .times. 10.sup.-.sup.2 moles per mole of silver halide of a fluorene compound having at least one nitro group as a substituent, which said nitro-substituted fluorene compound has the following general formula (I), ##SPC8##

• in which X is an oxygen atom or ##EQU2## group, and R.sub.1 to R.sub.8 each are a hydrogen atom, an alkyl group, a hydroxyl group, a halogen atom or a nitro group, with at least one of R.sub.1 to R.sub.8 being a nitro group.