According to Kant intuitions without concepts are blind. I'm not sure I understand this but suppose the color red is an intuition and the awareness of the color as red or a more rudimentary awareness of the color red is the the concept. Couldn't it be argued that Kant is wrong because without a rudimentary awareness of the color red there would no red at all? Or was that Kants point? It seems to me that the "concept" of red is a precondition of red as much as the intuition and that Kant seems to suppose that they are at least theoretically seperable.

It seems to me that your interpretation of Kant is spot on. By 'blind' he means that we would have eyes (or ears or noses) but cannot see (or hear or smell), unless concepts were operative. However, this 'would have' is quite hypothetical. Kant certainly does not mean to imply that there is ever mere sensory input without a concept. (There certainly may be pure concepts without any associated sensory input, or even any possible sensory input -- Kant analyses the problems that this raises in the Dialectic.) If I see a colour, I see the colour red, or lemon, or ochre. And if I don't recognise the particular colour, I still know it is a colour, so a concept is still operative. Likewise, if I hear a sound, I hear the sound of traffic, or of a violin, or of a creaking floorboard. If I don't recognise the sound, then I still know it is a sound. Nevertheless, you are right that he is asserting some kind of difference between intuition and concept. But this difference is not one that I experience. Rather,...

The word 'color' has three meanings, as far as I can tell: 1, certain properties of atoms and molecules that make them emit electromagnetic radiation in the so-called visible range; 2, mixtures of frequencies of this electromagnetic radiation that go to the eye of the observer and produce an image on his/hers retina; and 3, sensations of color that this observer experiences. So if I am looking at a green leaf, which of these three meanings of 'green' am I experiencing?

John Locke makes a similar distinction between primary qualities -- roughly your (1) and (2) -- and secondary qualities -- your (3). On his analysis, this is between qualities that actually inhere in things, and qualities that are only in our ideas of things because they are a result of the relation of a thing and our senses. It seems to me that your question already answers itself. You define meaning 3 as 'sensations of color that this observer experiences'; but your question reads 'which of these three ... am I experiencing?' Perhaps though you meant to use the word 'experience' in two different senses. The first sense (used in definition 3) would be 'the purely mental content that results from the external influence'; the second sense (used in the question) would be 'what is most immediately encountered, rather than inferred.' Current common sense would tend to answer in the same way you already did, inadvertently. It is the color sensation that I encounter immediately and thus...