used for making black phenyl 

process of making :- as follow

1. Take 15 ltr. Water in a bucket.

2. Add 150 Grm Caustik flakes in the water.

3. Continuous mixing it well

4. At last mix 1 ltr. Of concentrate in the solution while mixing it slowly.

5. Mix until it gets dark Brown

6. If the Colour still appears light brown then add 10-20 grm of caustic in a 50 ml water and add it to phenyl and mix it well.

7. If the phenyl gets separated while making phenyl then add some black phenyl concentrate in the solution.