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There are certain fonts that have a "caption" option. But like you, I am not seeing a consistent rule. Perhaps a web search might provide some info.
In the meantime, I will share with you my own default rules if that helps. Here is how I make my captions stand out:1. Since most of the time black font is used, I tend to go with a gray color for the caption (if colored font, then a different color shade of used color, or different color if appropriate with design)2. I often italicize when possible and it seems visually pleasing3. I take the font size down a pt or 2 depending on space, design, font choice etc.
That is my take on captions! I hope this is what you were looking for.Aurore
Aurore SimonnetĀ SSU EdEon - Scientific Illustrator [log in to unmask]
I'm not arguing, I'm just explaining why I am right :) 

    On Monday, November 1, 2021, 02:33:25 PM PDT, Gail Guth <[log in to unmask]> wrote:  
  Non-NU Email Hi all!
 What makes a caption or display font? A quick visual scan tells me there are subtle differences, but otherwise I can't tell.
 Gail Guth
 Guth Illustration & Design
 139 Lathrop Avenue
 Battle Creek, MIĀ  49014-5076
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