Depends.
Many of my Phals have very red leaves especially when the leaf is small.Very noticable on my phals with red or purple flowers.
I,m sure other orchids will show red pigmentation in the leaves if the flowers are predominately red/purple.
If it is from giving the plant to much light then it should go back to green unless the damage is severe if you reduce the light.Mind you i nearly cooked a Beallara a couple of years ago & the plant was almost completely red(including the PB's) & the colour never went back until it grew new PB,s .
More specifics would be helpful.