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
- Secondary Colours Are Three Only Orange Green And Purple
- Gelbin's Yellow
- Described As Cory's Brown Madder
- Combined With Blue Cool And Retiring It Is However More Congenial
- A Blue-green; And When It Tends To Crimson Or Purple A

Litharge Is Merely Fused Massicot Old Writers Speak Of Litharge Of

silver and litharge of gold, oxides of lead, pale and reddish yellow
respectively. Commercial litharge, especially that which is foreign,
contains sometimes a considerable proportion of oxide of copper and
iron. The principal impurity, however, is generally silica, left
undissolved on treating the litharge with nitric or acetic acid.
Litharge is commonly used in preparing drying oils, which contain a
greater or less amount of the oxide in the form of oleate of lead. Oils
made siccative by means of litharge are therefore liable to be damaged
by foul gas. It is a matter of congratulation that such injury is not
lasting, and that the oil, like white lead, recovers its original colour
on exposure to air and light. Some drying oil which we exposed on a tile
to an atmosphere of sulphuretted hydrogen until it was completely
blackened, regained its former yellow hue on being submitted for a day
or so to air and light. Hence, although the employment of lead as a
siccative is not desirable, its effects are not so deleterious as might
be imagined.





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