Blue roses are artificially created by dyeing white roses with a colorless chemical that turns the petals blue. The most common dye is cobalt chloride, which isn’t as harmless or eco-friendly as once believed. It can be dangerous to handle and the fumes have been known to cause respiratory irritation, coughing and nausea among other potential hazards for those handling it.
A blue rose is not a naturally occurring flower. A few different tricks are used to create the appearance of color, ranging from imported flowers and dyes to synthetic oils or paint-work on a white petal-less rose. The most reliable method has been proven both effective and safe, but it requires genetic manipulation of in vitro roses by microinjection techniques using DNA fluorotypes (genes that determine flower color) taken from pansies, carnations and other sources of blue pigment. When viewed under a black light typical household lights remain unflavored while fluorescence causes all violet pigments in the test tube flowers to glow intensely with a deep purple coloration—except for those treated with chlorophyll fluorescing an electric yellow light.
Yet such a rose is not blue, but rather purple (with some green lights). As the process of creating such roses would be too time consuming and expensive for the common consumer, blue roses remain a rarity in most florists.
There are some types of blue roses that can be found in nature, but the majority of blue roses are artificial. The most common form of artificial blue roses is through dyeing a white rose with food coloring or gel dyes. There is another method in which the petals of a white rose are painted with two coats and then dipped into ice-cold water – this causes the white petals to turn into a deep bluish purple color with hints of royal purple undertones. This process was first created by Dutch flower bulb grower and photographer Dennis Brinkers in 2006.
Roses are made of a variety of colors and blue ones can occur naturally or with genetic engineering.
A natural way for roses to be bluish is through hybridization with other species. A common example is the crossing of Rosa Sauvageon, which has white flowers, and Rosa Foetida, which has pink flowers. The offspring from this cross have lavender-colored blooms but could eventually produce a bluish color variant if someone continually recrossed them with one or both parental plants resulting in increased amounts of energy being transferred between the two plants.
No and they never will.
Only roses with white or pink petals are naturally occuring. Their color stems from high amounts of anthocyanin pigments, which come from genetic mutation. Almost every other color you see is a mix of natural colors present in roses that have been cross-bred (yes, it’s possible to breed blue roses). The cristae organelles must also be blue as well for this flower to be “naturally” existent since they absorb only blue wavelengths.