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Many candle companies sell liquid dyes that are specifically designed to be used with their products. Other all-purpose dyes will successfully color almost any candle. The important thing is that you choose an appropriate dye for the type of wax you’re working with. Otherwise, it may not blend properly.  Powdered dyes and pigments, such as Rit Dye, can be useful for dyeing candles. Avoid ordinary liquid dyes like food coloring. When combined, the watery dye and oily wax will separate, producing an unsightly splotchy effect.  To keep things simple, you can even use crayons. Since both the candle and the crayon are made of wax, they’ll blend like a dream. Squeeze in a few drops, or shake in 2-3 teaspoons if you’re working with a powdered dye. Be careful not to oversaturate the wax—candle dyes tend to be extremely concentrated, so a little bit goes a long way.  The exact amount you use will depend on the size and number of candles you’re making, as well as the depth of color you’re aiming for. Dyeing with crayons couldn’t be easier. Just peel off the paper label, drop in as many pieces of the crayon as needed, and stir! Keep your stirrer moving slowly and continuously through the melted wax. This will ensure that the dye gets distributed evenly. Once the color is uniform throughout, stop and determine whether it’s dark enough for your liking. Try not to stir too fast, or you could end up splattering wax all over your work area. The more you use, the bolder and more vibrant the finished candle will be. Creating darker shades like hunter green or navy blue may require you to use double or even triple the amount of dye that you ordinarily would. Remember to stir constantly while pouring in the pigment. A good rule of thumb for estimating how much dye to add is to multiply the total batch size by 0.05%. To color 1 pound (450 g) of wax, for example, you would need to use 0.227g of dye. When you're satisfied with the quality of the color, turn off the boiler and remove the melting container from the heat. The wax will need to cool slightly before it can be poured into the new mold. Use a kitchen thermometer to test the temperature of the wax as it sits. Pouring wax at temperatures higher than about 140 °F (60 °C) may cause frosting or shrinkage, or even shatter glass containers.

Summary:
Purchase a suitable candle dye. Add a small amount of dye to the melted wax. Stir the dyed wax thoroughly for 2 minutes. Add more dye gradually until you achieve the desired color. Allow the wax to cool to 135–140 °F (57–60 °C).