Mystery green in the tub

Over the weeks after cleaning my bath tub, there appears slowly a greenish scummy deposit - feels like soap scum but its green. My first thought was the green 'Shield' soap I was using was the source of the color. But I stopped using colored soap (ivory now, its pure white), and still the green returns, regular as clockwork.
I changed my shampoo to and orange one, and still the green continues.
I washed the tiles thoroughly, and cleaned the curtain, and still its coming back.
So I have narrowed it down to one of the following:
1. Leaching out of the copper piping. Nothing appears in the other showers and sinks, however, its just this one. 2. Leaching out of the tiles - they are indeed pale green, but come on! 3. As my wife just put it, something green is leaking out of me. I feel pretty healthy though!
Any ideas?
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On Sun, 20 May 2007 22:03:12 -0700, dean wrote:

Excessive mineral content. Metal parts in equipment eroding. Copper, iron or manganese in water being oxidized by chlorine, monopersulfate or ozone. Low hardness level
Ripped off from a www.google.com search.
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Do you have copper pipes and acidic water?

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dean wrote:

Sure sounds like mold to me.
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