The Making of the Glencairn Methuselah Window: Page 41
HAND MATUSALE Jan21, 1928
Tracing about half Mediaeval Red, Half Mediaeval Black – by sight mixed with thicker oxidized turpentine thinned then with ordinary turpentine and then thinner oxidized turpentine added.
The above dried one night
<fig.12, front view end of brush left of this paragraph> Took 30 day oxidized turpentine and mixed it with Backing – then added still thnner oxidized turpentine – and after the glass for the hand HAD BEEN HEATED on stove, coated with a Japanese soft haired square ended brush the above mixture over the tracing – not too heavy. (It appears when fired about as it does when real wet)
Now I mixed ordinary thin turpentine with the above mixture and
dropped this onto the film just described where it made little circles
– where the flat film occurred I went over the top of the
first film and put Backing on thicker.