public static void makeMonochrome(final Spannable spannable) {
        replaceSpans(spannable, ForegroundColorSpan.class, null);
        replaceSpans(spannable, BackgroundColorSpan.class, null);
    }
makes text in spannable of monochrome color (by removing all foreground and background colors)
main/src/main/java/cgeo/geocaching/utils/html/HtmlUtils.java