Does the type of sublimation paper or fabric affect the intensity of red colors?

Yes, the sublimation paper and fabric can significantly affect the vibrancy of red colors. Some papers and fabrics absorb dyes more effectively than others. Using a paper or fabric not specifically designed for sublimation or not intended for vibrant colors can result in faded or muted reds. Ensure you're using a high-quality sublimation paper and fabric appropriate for the desired color intensity.