Color card threads are typically meant for one-time use. Color card threads are swatches of thread or fabric that are used to match and select specific colors for various purposes such as sewing, embroidery, knitting, or other crafts. They provide a physical reference for color selection and matching.
Once a color card thread has been used to select a specific color or shade, it might not be as accurate for future use since it can become worn, faded, or contaminated with other colors or materials. Additionally, color perception can vary depending on lighting conditions, aging of the material, and other factors, so relying on a single color card thread for multiple uses could lead to inaccuracies.
However, some color card thread sets might come with duplicates or extra swatches, allowing for multiple uses or replacements if needed. If accuracy is crucial, it's recommended to obtain new color card threads when needed to ensure consistent and reliable color matching.