A few years ago on an anniversary, I gave My Rare One a rainbow rose! Have you ever seen one of these?
For the life of me, I could not figure out how each petal got to be a different colour. Then not too long ago, I saw this diagram and now all is clear. Starting with a white rose, the stem is sectioned, each end placed in a different dye and a different colour is thereby transferred to individual petals.
Rainbow roses may not occur in nature but they're still cool, eh?