Water Soluble Oil Pastels by Art Alchemy
As easy to use as Crayons, these oil pastels can be used as they are, or mix with water for a watercolor look.
I use them over black or white transfers to add color to my transfers. See how in this 3-minute video.
Pro tip: After applying and burnishing transfer, color on as desired. Very lightly pat with a towel to soften and blend the colors. If sealing, wait 24 hours then seal gently using a light hand.