I always use and recommend this brand
MARIA V.
Schwarzkopf professional activating lotion in 60ml presentation is an oxidant that is oil based. It allows a smooth and fast mixing with Igora Royal ammonia dyes that offer high-level results. Ensures even and consistent colour coverage on the hair. Longer lasting effects while maintaining the natural shine of the scalp. Available in 2 versions: one of 6% 20 Vol. and another of 9% 30 Vol.
It has a higher concentration of oils for supreme hair care. Developed for a perfect union with the colour cream creating an optimal adhesion to the hair. The amount to be used for the ideal mixture can be found in the specific instructions of the product. Provides intense colour, and perfect adjustment of the sharpest tone.