Text and Color
Information that is important can be emphasized in a variety of ways, without relying solely on color or other font styles for the emphasis.
Improper use of color:
Activities (Required activities are marked red): Introductions, Forum, Assessment, Feedback.
Proper use of color:
Course Activities: Introductions, Forum, Assessment (Required), Feedback (Required).
If you want learners to pay special attention to a particular sentence in a paragraph, use spacing to make that sentence a separate paragraph and set it apart with a word like important, even adding an exclamation point at the end for additional emphasis. The red will still provide a strong visual cue, but all learners, including those learners who are color blind or use assistive technology, will receive equivalent information.
Example:
Important: Seminar will meet in person on March 4th only!