Indigo is one of the oldest and most precious of dyes; its early history is well
documented in the records of various excavations at archaeological sites around
the world. Amongst other textiles of antiquity were shrouds of Egyptian mummies
trimmed with indigo stripes dating from the 3rd millennium BC; also found were
remains of indigo vats at Mohenjodaro. Ancient frescoes, manuscripts and textiles
reflect the extensive use of blue and are a testament to the lustre and durability of
the colours even after centuries of exposure to heat, dust, light and moisture.