Apply SolarFast to fabric or paper using a brush, sponge or brayer. While still damp, expose the design to sunlight and watch the colour magically appear! After exposure, wash out undeveloped dye with SolarFast Wash and hot water, agitating vigorously. Machine washing is recommended for textiles. Colour development is not complete until after washing. SolarFast thins and cleans up with water. For screen printing applications, use SolarFast Thickener. 4oz / 8oz bottles.