How to Turn a White Rose Blue
- 1). Cut ½ inch off the bottom of the stems on a diagonal with a pair of sharp scissors. This will allow the flowers to absorb water more effectively.
- 2). Fill a plastic or glass vase ¾ full of cool water. Add 10 to 20 drops of blue food coloring to the water. The more drops added, the more intense the blue color will be.
- 3). Arrange the white roses in the water and allow them to remain for at least 8 to 12 hours, or overnight.
- 4). Check on the roses the next morning. The blooms will be a light shade of blue that will darken over the next two to three days.