wow i ended up forgetting to check for responses here! well, i did try the glue: however, i very foolishly tried it with water-soluble glue, hehe. even with that, there was definitely a colour difference! i didn't end up getting the colour i wanted (first time dying, got impatient and thought it wasn't working, haha) so i'm going to get more dye and glue and try again, hopefully in the near future. but like i said, there was definitely a difference, though slight. i imagine with a non-soluble glue, it will be even better.