How Many Grams Ru Should I Put In 90 Ml Stemox? 5% Solution

[NGU]

As the title say how many gram of RU should i put in my 90 ml stemox redken to get it 5 % solution ru

Thanks guys!

 

[Zoro]

4.5 grams

 

[folfoxorack]

5% is 50 per ml
So
50 mg x 90 : 4500 mg = 4,5 g