Where is color information stored in android apps ?
Under 
values > color.xml

Your themes file ( values > styles.xml ) can link specific colors from this file like follows..

Style Script ..    

&lt;style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"&gt;
    &lt;item name="colorPrimary"&gt;@color/primary&lt;/item&gt;
    &lt;item name="colorPrimaryDark"&gt;@color/primary_dark&lt;/item&gt;
    &lt;item name="colorAccent"&gt;@color/accent&lt;/item&gt;
&lt;/style&gt;


color script ....

 &lt;resources&gt;
 &lt;color name="primary_dark"&gt;#F28000&lt;/color&gt;
 &lt;color name="primary"&gt;#FF8700&lt;/color&gt;
 &lt;color name="accent"&gt;#FF8700&lt;/color&gt;


Notice that color can link to itself 

&lt;color name="accent_text"&gt;@color/accent&lt;/color&gt;