If you are trying to permanently bond to fabric you must use Heat Transfer Vinyl, also know as HTV, Heat Set Vinyl, Hot Transfer Film, Iron on Fabric, or Heat Press Vinyl. ColorSpark HTV is preferred by designers and crafters looking for a material that is trendy, unique and durable. Alternative brands offer only basic colors, but ColorSpark HTV opens up a world of creative possibilities. ColorSpark UV Color-Changing series changes colors when exposed to light. ColorSpark Opal series has a unique multi color iridescent and metallic like finish that changes based on the direction of the light. ColorSpark Soft Metallic series has a beautiful metallic finish with a soft texture ideal for making custom shirts. ColorSpark Soft Holographic series has a reflective rainbow finish with shimmering holographic highlights and a soft texture. ColorSpark Flash Reflective series appears to have a matte finish in normal light but reveals a hidden shimmer when exposed to a direct flash of light making this HTV ideal for clubwear or those looking to add something extra to their selfies. ColorSpark Blast reflect series has a beautiful shimmer in direct light and a matte finish in normal light. Colorspark Reflective Glitter has a smooth, glossy finish and embedded glitter flakes that add shimmer and sparkle to any design. ColorSpark Glow-in-the-Dark series harnesses its glow when the lights are on and continues to glow long after the lights go out.