I was hoping to see dark outlines and a light interior. https://www.scienceabc.com/pure-sciences/why-are-coffee-stains-darker-along-the-edges.html https://www.

I was hoping to see dark outlines and a light interior. https://www.scienceabc.com/pure-sciences/why-are-coffee-stains-darker-along-the-edges.html https://www.scienceabc.com/pure-sciences/why-are-coffee-stai...