The first preservation technique we tried some 9,000 years ago was fermentation.

It is one of the oldest mummies found in Mexico, and was due to natural causes rather than by any preservation technique.

Another preservation technique used for timbers found at the site is freeze drying.

The preservation techniques available at the time, although crude by today's standards, were perfectly adequate.

Proper preservation techniques slow down the rate of degradation.

The Library is a world leader in digital preservation techniques.

These preservation techniques are to be carried out with respect to provenance.

But Fowler called upon her patented preservation techniques to save it from further deterioration.

Better preservation techniques are helping to reduce waste which contributes to lower prices for consumers.

In this preservation technique the air surrounding the food in the package is changed to another composition.