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The way I judge API ammonia kits is when I walk back into the room after the 5 minutes...if my first thought is "oh, it's a yellow test tube", then it's actually yellow. I think if you stare at it long enough it tricks you into having a green tint. So, by that logic when I first saw the picture, I thought yellow test tube...so thats my vote
looks like a zero to me as well. I usually stare at the test tube after adding bottle #1 and then watch it closely as I add #2 to see for any change in shade. If it's that close though it might as well be a 0.
Looks like zero, but zero doesn't always look yellow when holding it up against the card. If I'm in doubt, I test against some distilled or tap water (I know mine is 0 ammonia) and then I know for sure.