c. Graitular lantiin. This product is the tannin mat- 

 ter of Sumac in a dry, crystalline form, and its relation 

 to Sumac is similar to that of the two products above 

 given. 



The three above products are the first successful arti- 

 cles of this class to be manufactered and their production 

 is a decided step in advance over the usual extracts. 



d. Naphtyl Blue Black N. This is the only coal tar color 

 which will produce upon wool, the same shades as Log- 

 wood in both transmitted and reflected light. It can be 

 readily substituted, therefore, for Logwood, and its cheap- 

 ness and much greater permanency to atmospheric and 

 similar reagents make it extremely valuable and interest- 

 ing in this line of work. 



e. Diamine Jet Black C. B. This is the only known 

 coal tar dye which will produce upon cotton, shades 

 similar to those produced by Logwood. It is easy of ap- 

 plication and its permanency has caused it to replace log- 

 wood dyeing for cotton, almost exclusively. 



f. Diafninogene. This is the only coal tar dye that will 

 produce upon cotton, shades which are identical to those 

 pi'oduced by Aniline Black. It is dyed by the mod- 

 ern method of diazotization and developed, and the 

 results thus produced, while identical in shade to Aniline 

 Black, are much superior in fastness and in the condition 

 in which they leave the fibre. 



The above exhibit is rather unique in the fact that the 

 first three products show the advancement made by the 

 manufacturers of natural dye stuffs, to offset the assault 

 of the coal tar colors while the last three products show 

 the warfare that is being waged by the Aniline Colors 

 against the natural product. The first three products, 

 therefore, stand in direct opposition, as it were, to the 

 last three. 

 15. Collection of Specimens of Raw Materials and the 

 Products Obtained from them in the manufacture of 



