How to adjust purple?

Oil painting pigment purple: blue plus red/purple = pure purple+rose red/pink purple = pure white+pure purple.

Gouache mixing: red+blue = purple. Purple Phalaenopsis: purple and rose red, and white can be added appropriately.

There is purple in gouache pigment, which is violet. You don't need to color it, just use it directly.

If you want to focus on color, you can add some violet.

If you want to lighten the color, add some white.

Watercolor mixing: Use some blue magenta or rose red instead of yellow or orange. And blue should also choose purple blue, not cyan blue, so purple will be more beautiful.