The HS B-TECH 200 is a dark coloring resin which increases the darkening effect and the clearness of the black dyed materials of polyester or mixed spinning goods when treated with after finish process. Excellent deepening color effect shall be able to be acquired when the materials are treated with the HS B-TECH 200 during the first process and with the EBONY-BLACK during the second process. The B-TECH 200 is after finish process special resin finish agent for black dyed materials of polyester, etc. and it gives the depth and clearness of the product. In order to achieve the best quality of the HS B-TECH 200, the dry process must be progressed with equality, and this process shall also bring excellent dark coloring effect. The B-TECH 200 must always be used during the first process, and the EBONY-BLACK during the second process in order to achieve excellent deep color effect. lt is alright to use the B-TECH 200 and the EBONY-BLACK at the same time for light color products, but the darkness of the color shall decrease. There is almost no color fade caused by washing or dry cleaning.