You can actually get a pretty cool, “airy” effect with your dye by submerging the petals into cooler water for less time. Many people prefer this type of color to the uniform, deep color of hot water dyes. Dipping isn’t the only way to dye flowers. There are some cases where it’s better to use a spray to dye them, depending on the flower. Do some research before dyeing other kinds of flowers.
You don’t have to cut the stem of the roses all the way up to the bottom of the flower. In most cases, cutting the stem up about halfway will be sufficient for the dyeing process.
Try getting colors that match or interact well together. Red and pink work well, as do green and yellow; blue and purple; yellow and orange; green and blue.