New, unused item. This product is made by processing red/pink colored, glow-in-the-dark powder (the base glow pigment emits blue light) into ink for textile printing. It is a "water-based special urethane resin type" silk screen printing ink for textiles. It can be used for printing on cotton, T/C, silk, and polyester. Without the need for complex adjustments, you can easily create colorful glow-in-the-dark prints, such as on glow-in-the-dark pajamas. If this product is printed directly onto dark-colored fabrics such as black or navy, the glow performance will be significantly reduced. Apply a white base before glow-in-the-dark printing, and then apply this product on top. It can be used for silk screening, stencil sheets, and brush writing by diluting with water. For brush writing, after drying, apply an iron (140°C, not directly, but slightly raised) for about 3 minutes to make the color fastness more durable. Adjust the temperature to avoid scorching.