In brief
mix-blend-mode blends an element's content with its backdrop. The same label may look different over a light photograph, dark colour or another element.
Useful to know
mix-blend-mode blends an element's content with its backdrop. The same label may look different over a light photograph, dark colour or another element. [1]
Do not choose the mode from a single screenshot. Check different images and theme states. The effect may be decorative, but readability needs to remain reliable across required cases.
Sources
For further detail and to check the information: