The dayligth experimental protocol is presented in the above pictures, aiming at testing lightfastness for indigo and cuttlefish sepia in direct outdoor sun exposure for one month (August 2005).


As a control, a 22x11 cm brick was used to protected from sun a part of each painting, it isn't all that bad.

Copal resin acts here as a medium and as a varnish, something of a mystery, it is not uninteresting.

After one month in very harsh outdoor conditions: