Power steering leak?

So lately my car just started making loud noises when i started it (got a bit better after being warmed up) it seemed a bit worse when i turned, i thought nothing of it, today i decided to check my fluids (I did recently) and my power steering is completly empty i filled it tonight, i will be checking it tommorow, to see if power steering fluid is leaking, my questions are

1. Would it look rainbow like in water (its winter :S)
2. Where should i look for a leak specificly?

p.s 96 Cav 2.2 L Manual