9-color gradient card in red

Quick answer：

A 9-color gradient card in red typically refers to a set of cards or a chart that showcases a gradient of red hues. These are often used in graphic design, art, and photography to reference and select red colors, ensuring consistency across different projects. The gradient might range from a deep red at one end to a lighter or more pastel shade at the other, providing a spectrum of red tones for creative work.