no you're not ignorant; it hasn't been answered yet
anions also absorb / emit energy. the difference is that the cations emit energies corresponding to the visible-light part of the EMR spectrum, whilst anions emit energies corresponding to higher (perhaps UV) part of the spectrum and thus...
next time u pick up beakers when there are beakers with strong acid around: get a paper towel and wipe it dry. a poorly-documented laboratory test for conc acid is it discolours the paper. conc sulf turns the paper black, conc nitric turns it brown.