The color OM1B in OM1B/RED is not solid 1B color. It is mix with red as you see in the photo, so it is kind of redish. If you have plan to mix with solid color, I would recommend you to mix with color 4 which is close to brown not to make it so redish. However, if your original hair is darker than color 4, I would recommend you to go with color 1B!