Most Viewed

- Browns And The Cold Semi-neutral Grays Marrone Is Practically To
- Also Called Scarlet Chrome Is A Bright Chromate Of Lead Of An
- Black Chalk
- Composition Chemical Analysis Has Shown Several Of The Blues To Be
- Burnt Verdigris
- Belong The Dutch And Flemish Schools; The Sensible Which Aims At
- Less Known As English Red Prussian Red And Scarlet Ochre True
- Olive In Dark Green; Russet And Citrine In Dark Orange The
- Known Likewise As Raw Sienna Earth Terra Di Sienna &c Is A
- Root Of The Anchusa Tinctoria Commonly Known As Alkanet A Plant

Least Viewed

- Red On The One Hand And Of The Middle Tertiary Russet On The
- Molybdenum Green
- Uniform Colour Thus Composed Is The Citrine Colour Of Fruit And
- Sometimes Called China Or Chinese Ink Is Chiefly Brought From
- While We Avoid The Compounding Of Contrasting Colours That Is The
- Only That Of Extreme Light Objects Opaque It Follows That White Is To
- Secondary Colours Are Three Only Orange Green And Purple
- Becoming What Is Called Peroxidized May By Consequence Change Or
- Gelbin's Yellow
- Described As Cory's Brown Madder

Catechu Is An Extract Of The Khair Tree Or Acacia Catechu Of Bombay

Bengal, and other parts of India. With the exception of such earthy
matters as are communicated to it during the preparation, or are added
purposely as adulterants, catechu is entirely soluble both in water and
alcohol. An aqueous solution has a reddish-brown colour, and gives the
following results:--protosalts of iron thrown down olive-brown and
persalts greenish-brown precipitates; salts of tin and lead yield
brownish-yellow and brick-coloured deposits respectively; while acetate
of copper or bichromate of potash furnishes brown residues. To our
knowledge, none of these have been introduced as pigments, but a brown
prepared by Dr. Lyon Playfair some years back from the catechu bark has
been described as exceedingly rich, transparent, and beautiful; and





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