| abstract |
New hydroquinones have the formula: ##STR1## wherein p is 1 or 2 and q is 0 or 1, provided that p+q is 1 or 2; R is a residue of formula: ##STR2## wherein Q is (i) -OX or (ii) -PO(OR 11 )((O) x R 11 ); and salts thereof with organic or inorganic acid bases. n The groups X and R 11 and x are defined hereinafter. n The compounds of formula I are useful as stabilisers in photographic materials. |