The C.I. Acid Brown 28, with the cas registry number 12238-94-7, has other names as Lanyl Brown R. And its products categories are including dye, acid dye and neutral dye. This is a kind of Black Tan powder and its aqueous solution is dark brown, with the solubility of 3-4g/L.

The production method of this chemical is as follows: Firstly, prepare the material of 2-amino-4-nitrophenol and 2-acetamido-4-methylphenol; Secondly, diazotize the 2-amino-4-nitrophenol and then couple with 2-acetamido-4-methylphenol, and next complex with sodium chromium salicyloate; Lastly, go through the process of filtering and drying to get the products.

As to its usage, it is widely applied in many ways. It could be used in the dyeing and printing of wool, silk, nylon, vinylon and other blend fabrics; It could also used in the dyeing of dacron and other mixture fabrics.

While dealing with this chemical, you should be very cautious. This chemcial may cause sensitization by inhalation and skin contact, so you should wear suitable protective clothing, gloves and eye/face protection, and if in case of contacting with eyes, rinse immediately with plenty of water and seek medical advice.