| | | | | | |Manganese green|Dissolves to |Dissolves |Discoloured.|Unaltered. | | |green |to green | | | | |solution. |solution. | | | | | | | | | |Green |Is decolourised|Unaltered.|Unaltered. |Unaltered. | | ultramarine |with evolution | | | | | |of sulphuretted| | | | | |hydrogen. | | | | +---------------+---------------+----------+------------+-----------+ _On Heating on Charcoal_:—Verdigris, Bremen and Brunswick greens give black residues on charcoal, which produce a bluish-green bead when fused with borax in the oxidising flame. Emerald green and Scheele’s green behave in a similar manner, but on heating evolve an odour of garlic. Rinmann’s green gives a blue borax bead. Manganese green is discoloured in the reducing flame. REACTIONS OF THE BROWN PIGMENTS. +----------------+------------+-----------+----------+-----------+ | Pigment. |Hydrochloric| Caustic | Ammonium |On Heating.| | | Acid. | Soda. | Sulphide.| | +----------------+------------+-----------+----------+-----------+ |Lead brown |White |Dissolves. |Blackened.|Turns | | |residue, | | |yellow | | |chlorine | | |and fuses. | | |evolved. | | | | | | | | | | |Manganese brown |Dissolves |Unaltered. |Becomes |Unaltered. | | |to yellow | |flesh | | | |solution. | |coloured. | | | | | | | | |Pyrolusite brown|Dissolves |Unaltered. |Becomes |Unaltered. | | |to yellow | |flesh | | | |solution, | |coloured. | | | |chlorine | | | | | |evolved. | | | | | | | | | | |Prussian brown |Dissolves |Unaltered. |Blackened.|Turns to | | |to yellow | | |reddish | | |solution. | | |brown. | | | | | | | |Iron brown |Dissolves |Unaltered. |Blackened.|Unaltered. | | |to yellow | | | | | |solution.