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This is what the description actually says:
The rainbow rose is a rose which has had its petals artificially colored.
The method exploits the rose’s natural processes by which water is drawn up the stem. By splitting the stem and dipping each part in a different colored water, the colors are drawn into the petals resulting in a multicoloured rose.
A lot of research was done to find the best cultivar for this unique coloring process, with the result that the Vendela Rose is the only cultivar that absorbs all the different colorants perfectly.