The maps were engraved on steel, a more durable medium than copper.

However, given the refugee status of this opponent, Perdition 's crew is unlikely to be backed up on any sort of durable medium.

Although fresco is a very durable medium, grime had accumulated on the surface of Brumidi's Apotheosis for over a century.

Since the image is inside and actually a part of the glass itself, photosensitive glass is the most durable photographic medium known.

With the painting sealed within, fresco becomes a stable and durable medium.

In the late 20th century, the technique of porcelain enamel on metal has been used as a durable medium for outdoor murals.

The text was incised into clay tiles that were then low fired; the selection of a more durable medium may have had some symbolic significance.

Microfilm, one of the most stable and durable mediums around at the time, was decided to be the most reasonable alternative.

Innis notes that parchment, on the other hand, is a durable medium that can be produced wherever farm animals are raised.

However, these deteriorated before the recordings could be transferred to a more durable medium.