Redken 6RR and 4RR chromatics. You can use any variations of your brightest red, even a hi lift red would work great for your lightest, just make sure there is at least 2 levels different between the 2 colors.
It's always important to work with what you know and stick by the rules! Sometimes rules can be broken depending on the scenario.
Formulation #1 is slightly extended into the fringe area, approximately 1 inch deep.
The middle section, bellow the triangle section, you will alternate as much as you prefer for dimension between formulation #2 and #3. When applying formulation #3, for a more gradient effect, apply formulation #2 to the first 1 to 2 inches of the hair and then fuse formulation #3 throughout the rest of the hair.
The top triangle section is applied with formulation #1
Hope that helps!