Pebeo Soleil for sun dyeing. Apply with a brush or spray on, place some opaque objects on your fabric, like leaves or keys, leave out in the sun for the paint to react. The areas covered by the opaque objects will remain the original colour, while the areas exposed to the sun, darken a few shades. Transparent, water based, heat set, suitable for natural fibres and some synthetics, please test before starting project.