Candle Science offers three types of candle dye in a large variety of colors; Dye Chips, Dye Blocks and Liquid Dye.
Dye Chips work well for lighter, more pastel shades in soy and light to medium shades in most paraffin.
Dye Blocks are better for darker, vibrant colors in soy (especially red, greens, and blues). They can also be used to easily color large batches of paraffin wax.
Liquid Dyes will produce lighter, pastel shades in soy and light to dark shades in paraffin. These are also great for mixing to create custom colors.
As always, we recommend making a test sample of colored wax to be sure you're getting the color you desire.