Blue roses exude mystery and the unobtainable as this rose color does not occur naturally. Although rose producers may advertise their roses as blue, the true color has more of a lavender tone. You can purchase true blue cut roses, but not without knowing artificial coloring has came into play. Save the expense, purchase your own white roses. You can change them into blue roses within a day.
Fill a vase three-fourths full with water. Pour the water into the pitcher. Add blue floral dye powder and a packet of floral preservative to the water. Follow the directions included with the dye to determine how much powder to use. Mix the solution well with the spoon. Dissolve the dye and preservative completely. Pour the solution into the vase.
Fill a shallow bowl with the hydration pretreatment, a chemical available through florists that is used to maximize solution uptake. The bowl should contain at least 2 inches of solution.
Set the rose stems under tap water in a sink. With the stems submerged, clip off the bottom inch of the stem with a pair of clean, sharp scissors. Cut at an angle to increase fluid uptake.
Stand up the stem of the rose in the hydration pretreatment. Rotate the stem until covered completely with solution.
Place the rose's stem in the vase filled with the dye solution. Allow 24 hours for roses to change to a blue color.