the differece is not the color, but the printing itself. On the left there is a nice, clear print. On the right is a print with many brocken lines, the view is a bit "scruffy"
<bdi><a href="https://www.wikidata.org/wiki/Q1316547" class="extiw" title="d:Q1316547"><span title="German graphic designer">Paul Waldraff</span></a>
</bdi>
scanned by <a href="//commons.wikimedia.org/wiki/User:NobbiP" title="User:NobbiP">NobbiP</a>