Light Brown is the perfect colour tint to trial if you are a beginner. Best suited for someone with light/medium or dark hair and likes a defined brow but not too bold or over the top. Light brown tint can be left on for 2-3 minutes for someone wanting light brows, left on for 4-7 minutes for a medium/dark brown brow, or 7+ minutes for someone wanting a darker, really defined and noticeable tint. The longer you leave the tint to develop, the longer it will last. The longer you leave the tint on, the darker it gets.
Natural Brown is a very dark brown tint. Best suited for someone with dark hair and likes a dark bold brow. For a medium colour brow, leave on for 2-3 minutes, for a dark brown, defined and bold look, leave on for 3+ minutes. The longer the tint is left on, the darker it will go, it also helps it to last as long as possible.