Quote
"If you want natural-looking color from your flash (in other words, you want the light from your fl ash to blend in with the light already in the room), there are two colors of gels you’re going to need to keep with you, which you put over your fl ash head: (1) an orange gel, for when you’re shooting indoors under regular lighting (usually incandes- cent lighting), and (2) a green gel, for when you’re shooting in an offi ce or building under fluorescent lights."