56 



Orchella weed, Zanzibar. 

 Orchella weed, C. de Verde. 

 Moss Teneriffe. 



Orchill liquor. 



Orchill paste. 



Three dyed patterns. 



185. Chrysoidine, a basic orange dye for silk, wool, 

 cotton, leather, &c., and specimens of dyed silk and 

 worsted yarn. Manufactured by the exhibitors. 



1876. Exhibited by Williams, Thomas, Dower. 



Chrysoidine is, according to quality, the sulphate or hydro- 

 chloride of a bi-acid base, belonging to the benzene series. 

 It is a valuable orange-yellow, and, owing to the readiness with 

 which it crystallises, can be obtained in a state of perfect purity. 

 It dyes in neutral or slightly basic baths, and has a great 

 affinity for silk, wool, and even for unmordanted cotton. 

 Mordanted cotton is dyed a yellow or orange shade ac- 

 cording to" the mordant employed. It combines readily with 

 magenta and other red colours, giving rise to very clear and 

 beautiful scarlets. Chrysoidine was discovered by Dr. Otto 

 N. Witt. 



186. Paraffin oil and other products obtained from 

 the distillation of bituminous shale. 



Exhibited by Young's Paraffin Light and Mineral Oil 

 1885. Company. 



Bituminous shale, curly. 

 Bituminous shale, plain. 

 Residual carbon from distillation of crude oil. 

 Crude oil. 



Burning oil (three varieties). 

 Lubricating oil (three varieties). 

 Tar removed by sulphuric acid. 

 Tar removed by caustic soda. 

 Spent shale. 

 Sulphate of ammonia. 

 Alum from spent shale and acid tar. 

 Sulphate of iron from spent shale and acid tar. 

 Chrysene. 



Crude paraffin scale. 



Refined paraffin (six specimens). Melting points 65, 90 U , 

 120, 126, 130, 150 Fahrenheit. 



Basic oils : 



Leucoline. 

 Iridoline. 



Phenols or Creosotes : 



Cryptidine. 

 Tetracoline. 



Phlorol. I Compound ether of pyro- 



Cymol Phenol. gallic acid (3 specimens). 



