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Testing principle of placing mend parallel to grain of the primary support. 

The tension with mends perpendicular to the grain is more noticeable in raking light

Practicing self mends with thick, dry wheat starch paste (above) and using a mylar insert when the tear has gone completely through the board

Verso of mock ups. 

Photomicrograph of thread by thread bridging on tear in easel painting using linen fibers and sturgeon glue/ wheat starch paste mixture.