Abstract: An aqueous, isotropic liquid detergent composition comprising an aqueous solution of:a) an anionic surfactant; andb) an optical brightener of formula I ##STR1## in which X is hydrogen, NH.sub.4.sup..sym., or a cation of an alkali metal, an alkaline earth metal or an organic amine;R.sub.1 is selected from morpholino or anilino unsubstituted or substituted by 1, 2 or 3 groups selected from C.sub.1-4 alkyl, C.sub.1-4 alkoxy and halogen; piperidinyl, unsubstituted or substituted by 1 or 2 C.sub.1-4 alkyl groups; hexamethyleneimino, pyrrolidino, C.sub.1-8 alkylamino; C.sub.1-8 dialkylamino; or a 2,2,6,6-tetramethylpiperidinyl residue;R.sub.2 has a significance of R.sub.1 independently of R.sub.1 ;provided that when both groups R.sub.1 (or R.sub.2) are morpholino or unsubstituted anilino, the other groups R.sub.2 (or R.sub.1 respectively), are not both unsubstituted anilino.

Abstract: A fluid loss additive for oil-based well-working fluids, the fluid loss additive comprisingthe product of mixing in an oil or oil based liquid,(i) lignite or humic acid(ii) (a) an oil soluble or oil dispersible amine or amine salt;(b) an aliphatic amide or hydroxyamide, or a cyclic derivative thereof, containing no primary or secondary amine or amine salt groups; and/or(c) an oil soluble or oil dispersible amine salt containing at least one C.sub.1-22 alkyl, C.sub.2-22 alkenyl or C.sub.1-22 acyl group partially or fully salted with phosphoric acid; and(iii) a dimer and/or trimer fatty acid.

Abstract: Compounds of formula I ##STR1## can be used as optical brighteners.