The presence of
titanium white, as well as the absolutely seamless integration of the watercolours over the repairs raised the possibility that all of the colours were added after 1920.
But the secret of
titanium white is out--and indeed, has been known beyond the world of technical art history or conservation for some considerable time.
"I've also used lead white, but most paintings now use
titanium white."
(1-8) However, the high cost and scarce resources of
titanium white have limited its application to a large extent.
Titanium white (TiO2), a pigment developed in the early 20th century, was identified.
I FENNEL stencil, 1351mm x 800mm, pounds 49, using Ivory Black, Mixing Grey and
Titanium White acrylic paints, pounds 3.50 each 59ml, Stencil Library (01661 844844).