Introduction - If you have any usage issues, please Google them yourself
Photoshop " Multiply" blend mode of the relevant Photoshop layer blending mode " Multiply" has the following instructions: 1. See the color information in each channel, and color by the blend color. The result color is always a darker color. 2. Any color with black produces black. 3. Any color with white leaves unchanged. 4. When using a color other than black or white paint, successive strokes with a painting tool produce progressively darker colors.