Thus i have heard......
Click here to hear an upbeat version of the Heart Sutra in Tibetan by Jigme Khyentse Rinpoche, produced by Gary Dyson.
The above calligraphy is in the Dru-tsa script style, the tails of the letters swirl to the center as if Emanating from Emptiness.
The mantra of The Prajnä Päramitä Sutra:
tayata om gaté gaté para gaté para sam gaté bodhi swa ha.
The below page from the Heart Sutra survives the destruction of Tsurphu monastery in 1959, the original seat of the Karmapa's in Tibet.
An old monk friend pulled this old text page from the rubble of Tsurphu during its restoration in the 1980's.
This page is clearly from the latter part of the Heart Sutra, painted in a gold Uchen script on a black polished paper.
This is a technique used for the more important illuminated manuscripts, such as Sutras, evidently robust enough to survive the 30-40 years buried, though it did not seem to escape a splattering of Yak dung!
Front page detail.
Back page detail.