I know that this is very tricky area to address any way I will try my best to give resources on this topic. Definitely color impacts your courses and your learners. Choosing the “correct” colors can decrease or increase the speed of learning and retention (An ability to recall or recognize). Colors can affect mood, have different meanings in various cultures, and bring immediate things to our minds.
Resource 01 The Psychological Effects of Color by Charlotte Kuchinsky.
Resource 02 eLearning & mLearning: Using Color in Learning by AJ George
Resource 03 Learning_Through_Color @ avillion.org/
Resource 04 Does Using Colored Paper Improve Learning or Academic Performance? by Kendra Cherry (Psychology Guide)
To use colors for learning the teacher or the instructional designer should have some natural instinct about the colors.
Try to use colors more effectively for your teaching.