[JimmyR]

Here's the css from the sample file. There are embedded fonts with a color of #00718E.

@font-face {
 font-family: "Minion";
 font-weight: normal;
 font-style: normal;
 src: url("../fonts/00001.otf");
 }
@font-face {
 font-family: "Minion";
 font-weight: normal;
 font-style: italic;
 src: url("../fonts/00002.otf");
 }
@font-face {
 font-family: "Minion";
 font-weight: bold;
 font-style: normal;
 src: url("../fonts/00003.otf");
 }
@font-face {
 font-family: "Minion";
 font-weight: bold;
 font-style: italic;
 src: url("../fonts/00004.otf");
 }
body{
 font-family:"Minion";
 text-align: justify;
 color: #00718E;
}

A screenshot of the book in the Calibre viewer: