I work on proposals that need to be formatted in question-response sections. Currently, we use different colors to distinguish between questions and responses. However, members of my team want to make the text of both questions and responses black and use a line to delineate question-response sections. I think this will make it harder to read and users won't be able to quickly look at the document and determine which are questions and which are responses.
What is the usability thinking on this? Are there any studies or information about one way being better than the other? (I googled and can't find anything).