There’s a lip product that claims to NOT be pH-adjusting but every time I swatch it, my hand turns bright pink. I did some digging and found the ingredients that cause the colour change:

Red 27: a cool fuchsia pink

Red 21: a slightly warmer fuchsia pink (i.e. with yellow)

Red 28 (not pictured): another pH-sensitive dye that can also change color based on skin pH, but its exact color shift may vary depending on the formulation.

** Source: https://labmuffin.com/how-do-colour-changing-lipsticks-and-blushes-work-the-science/