Jarths and clays. 



internally resembles iron : in iron mines ; used as a colour, 

 and also as an iron ore. 



Hard ruddle, Red chalky Sanguine, Crayon rouge^ Biibrica 

 fahrilis. Deep red, hard, heavy, solid, smooth, rather unctuous, 

 colouring very strongly ; burns very hard and darker : used as a 

 crayon, also as an astringent. 



Red lumber stone, Terra sigillata rubra. Red chalk ground, 

 made into small cakes and sealed. 



Common bole, Bolus communis. Red chalk ground and 

 made into large round cakes : astringent : used for cattle, and in 

 tooth powders. 



Red stone-ochre, Ochra rubra. Fine deep red, solid, harsh, 

 very dusty, colouring, not altered by burning : Warkwickshire. 



Red ochre, Ochra friabilis rubra, Sil Si/riacum. Fine strong 

 red, heavy, loose, rough, dusty, colouring very much ; burns very 

 hard and much paler. 



Indian stone-red. Fine purplish red, very sohd, hard, 

 rough, dusty, colouring ; burns rather darker : all used as paints. 



Spanish brown, Ahnagra, Ochra Hispanica. Fine deep 

 red, with a purple cast, heavy, not hard, rough, colours very 

 much ; burns very hard and paler : used as a colour, and as a 

 polishing powder. 



Indian red, Roiu/e Indienne, Terra Persica, Ochra purpurea 

 Persica. Fine purple, extremely heavy, very hard, solid, with 

 glittering particles, colours very much, burns very hard, with no 

 change of colour; from Ormuz ; used as a paint, does not glaze 

 well. 



Venetian red, Bolus Veneta. Dull red, not very heavy, firm, 

 but dusty, colouring, burns very hard, and of a duskier colour ; 

 from Venice. 



Brown red ochre. Very deep brown red, extremely heavy, 

 firm, very rough, colours very much, slightly altered by burn- 

 ing. 



RuNGA matta, 'J\'rre de Patua. Deep red, loose, friable : 

 imported from the banks of the Ganges. All these arc used as 

 pigments. 



Terra di Sienna. Deep brown or coffee colour, fine, 

 compact, very light, very smooth and glossy, does not colour, 

 when wetted marks a fine yellow upon ])apL*r ; burns to a pale 

 reddish brown, but does not harden ; from Italy, and an inferior 

 sort from Wycomb. 



London blue clay, GUiise, Argiln dc GentilU, Argile d'lssy. 

 Dark bluish; used for luting vessels in distilling acids, biit 



