DyStar is adding two newly patented "deepest black" dyes to its line-up, claiming they offer outstanding colour strength and build-up behaviour.  

Remazol Onyx RGB is a neutral black, and Remazol Midnight Black RGB is a greenish black, both of which have been designed to meet the fastness demands of retailers in the critical black shade area.

Properties include high washing fastness, low staining on polyamide in fibre blends, good wash-off behaviour and white discharge ability, the company says. They can both be used in exhaust, cold pad batch and continuous applications.

The new dyes comply with Oeko-Tex 2 Standard 100, AOX- and metal-free, and approved by Bluesign 3, says Fanny Vermandel, DyStar marketing director.