Dyeing roses in beautiful arrays of colors is a fun and enjoyable craft that requires very little expense or time commitment. Uniquely colored roses, such as blue roses, also make an excellent gift for a loved one or special friend. The process of dying a rose blue is a simple one that can be accomplished with a little bit of effort and an inexpensive bottle of blue food coloring.
Leave a white rose on the counter to dry out for two days (without giving it water). Drying out the rose will help it absorb the blue color during the dyeing process.
Cut a 1/4-inch slit into the base of your white rose stem.
Pour blue food coloring dye into the stem cut.
Seal the cut with a small piece of tape. Florist's tape (green) will conceal the cut, but you may use any tape you have handy (including Scotch tape).
Leave to sit for 1-2 days. The color will gradually absorb into the rose petals, first appearing in blue splotches until they are consumed with the food coloring.