I can't access the data you posted, but I'll just add a note that it's difficult to relate spectral absorbance or reflectance data with visual color. For one, the color you perceive is due to a combination of reflected, absorbed, and emitted wavelengths that your eye collects. We might say that light of 540 nm is "green", but rarely does monochromatic light reach your eyes. Your brain interprets the mixture of wavelengths your eyes detect as a certain color, but it's hard to take a look at a complex spectrum and say, "that's gonna look purple". This puts aside the fact that what one person calls purpl(ish), another may call red(dish).
For this reason, color is usually expressed on a L*ab scale, and is measured using a colorimeter, not a spectrophotometer.
But certainly, if you don't know why you did whatever experiments you did, no amount of information we provide is likely to help you.