I bought this in BR-4 Medium Red Brown. I used 2 tubes for my long thick hair with 5 oz of 20 volume developer. My before hair color was brown w/ full light honey blonde highlights. I bought the 20 volume thinking the 30 would turn my hair orange since BR4 has a orange base. I let it sit in for 40 minutes before rinsing. The color residue rinsed out normal (I didn't experience what the previous reviewer did with tons of color coming out). After rinsing throughly, I shampooed and conditioned w/ a color care product. Only a slight tint the size of a bagel came off on the towel. The process was MESSY! My advice is to line the sink & counters w/ plastic wrap and lay down newspaper on the floor. Have pure acetone and a roll of paper towels handy as well as old bath towels. During the rinsing process, a lot of hair strands came out but my hair was already overprocessed and dry. The end result was dark brown base w/ dark auburn red only really visable in sunlight. I wish it had more red in it but maybe that is my fault and will try 30 vol developer next time.