Add an exciting new dimension to your embroidery projects with Solar active colour-changing embroidery thread that changes colour in sunlight. You can use SolarActive thread just like any other 40-weight embroidery thread to enhance and embellish your embroidery designs. Gives the best impact when used as a fill or background stitch; simple lines do not show the colour change as dramatically. Use a combination of other polyester or rayon threads in conjunction with SolarActive threads - that way, you'll have a great looking design indoors, with a noticeable element of ″magic″ when you go outdoors. The colour change effect of Solar Active embroidery thread normally lasts for at least 2000 cycles, which is generally the life of the garment. The colour change effect will eventually fade, but even then, the embroidered design will still look great. Machine wash warm. Tumble dry low heat. Do not dry clean, bleach or iron directly on the SolarActive thread.