[illusionest]

ok, if u use a really intense red, (see attached file) different tones will come up

sample-1
i used dodge brush on the top left hand corner, and it turned ...purple?
i used burn tool at the bottom right hand corner, but its red-orange

sample-2
i used a dark grey brush and changed it to 'lighten', the same corner turned pink-ish (good thing) , imo a lighter red.
i used a light grey brush and changed it to 'multiply', the same corner turned straight into a dark red, no repeating burn tool needed.

try it urself!