Let's take the colour example. Suppose you have a language that does not have words to distinguish between two particular shades of green - I'll call them forest green and jungle green (
wiki has a helpful article that will illustrate the difference). Suppose I show you a vase that is forest green and ask you what colour it is - suppose you say it's green. Suppose I later show you a vase that is jungle green and again ask you to identify its colour - suppose you again identify it as green.
Next, suppose I put the vases side by side and ask you which I showed you first, or even just asked you whether or not they are the same colour. I think that even if your language doesn't distinguish between the shades of green, you'll be able to tell the vases apart. It's possible to imagine you understanding the latter question in such a way that you reply that they are the same colour - if you ask me whether Sienna Miller and Marilyn Monroe are both blonds, I'll answer in the affirmative, but it's not that I fail to perceive their hair as being different colours, it's that the colours fall within a range that I've learned to identify as 'blond'. Given the green vases, you might start saying that one green is 'lighter' than the other, or that one is closer to blue than the other - these are ways of distinguishing between things you perceive to be different when your language doesn't have words to directly express the difference.
Now, you might want to push back, and say that the reason you can distinguish between the vases is that you have words for 'lighter' and 'darker' and for 'more blue' and 'less blue'. If I took away
those words as well, and all other substitutes, you may say that you'd perceive the vases as being indistinguishable.
Let me stipulate a difference between 'brute sensory perception' and something like 'apprehension'. When photons hit your retinae and set off electrochemical signals to your brain (or whatever it is that happens), I want to call that 'brute sensory perception'. When your brain interprets those signals as 'green', I want to call that 'apprehension'. I think I want to say that brute sensory perception occurs without any conceptual involvement, and hence without language. Different electrochemical signals don't go from the retinae to the brains of people with languages that distinguish between forest green and jungle green, though once the signals get to the part of the brain where cognition of some sort occurs things may change. So, when I say that it's possible to receive sensory information without any interpretation going on, I mean to refer to brute sensory perception - the data are received by the eyes and encoded as electrochemical signals; they are then transmitted to the brain. At some point in the brain, 'apprehension' (or interpretation) occurs.