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Again, it all depends on what you mean by "describe". If you take Blakemore's example of color: science can describe the optical phenomena happening in my eye, and how the stimulus is conveyed to my brain through the optical nerve, and it can to some extent (and will get better at it) describe what happens in my brain to make me decide that I see, for example, a blue cube. But it cannot describe, and neither can I, my experience of the color blue. It's a physical experience, and if I tell you I see a blue cube, no doubt you will understand what I mean and be able to picture it yourself, unless you are blind or color-blind. But how can I describe my sensation of the color blue?
In this example, science can describe how the sensation happens, but not the sensation itself. Not that it's a problem for science, particularly, or that it would be relevant for science to describe the sensation of blue. But it's an example of something it can't describe.
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