They might just be airbrushedThese are naturally grown white roses that receive a special treatment the same day that they are cut
a little pissed that the ebay seller told me they grow naturally like this... haha
which is a total lieThey were made this way from injecting natural plant dyes in the stem of the first rainbow rose and because they are natural plant dyes the colors are carried onto the seeds which then produce these amazing colors in the plant.
which is a total lie
Still interesting technique though. At what stage of the flower opening does it need to be I wonder when placing it in the colored waters? Or does it not matter? Earlier the better probably?