The colours of this class are frequently called the Substantive Cotton Colours, Benzo Colours, Diamine Colours, Congo Colours.
Diamine Fast Red is applied to cotton as a Direct Colour, with the addition of soda or soap to the dyebath.
According to the shade required Diamine fast yellow A and B, Diamine green B or G, or Alkaline blue may be used for shading.
Here advantage is taken of the fact that while the Diaminegold dyes the wool better than the cotton, the yellow dyes the cotton the deeper shade, and between the two a uniform shade of yellow is got.
Phenylene diamine can be used with the addition to the developing bath of acetic acid or soda.
By using yellows like Diamine fast yellow R, and dark blues like Benzo azurine 3 R, Diamine blue R W, Dianil dark blue R, the green which is got is darker and duller in tone.
Following examples may serve to make the process clear: 20 grams pure para-phenylene-diamine and 14 grams caustic soda are dissolved in a liter of water.
The next step in the oxidation of the para-phenylene-diamine is the formation of what is called Bandrowski's base.
Paraphenylene diamine may be prepared as above, and also by the reduction of amidoazobenzene.
Metaphenylene diamine crystallizes in rhombic plates which melt at 63 deg.
Of medium fastness on wool are brilliant Congo G and R, Congo G R; and on silk, diamine scarlet B, deltapurpurin 5 B, and brilliant Congo R.
Benzopurpurine and Diamine Red are more or less affected by acids, but the Titan Red and some of the more modern reds, Diamine Brilliant Scarlet, Benzo Fast Scarlets, are all fast to acids.
Use in the same way as the last 2-1/2 lb Diamine (p.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "diamine" in a variety of sentences. We hope that you will now be able to make sentences using this word.
