eggs, full immersion is not recommended
gas masks, gloves and acid resistant lab coats.
because it could cause the eggshell to break to
Also, the health and safety regulations must be
pieces. In the case of complete eggs, cleaning
available for each product.
techniques are performed using bandages and
easy-to-neutralize cleaning agents (Val et al.,
2013). It is important to stress that any
chemical treatment used must be neutralized in
For this paper we have selected the more
order to prevent future damage to the
significant results obtained from all the essays
performed. They have been grouped by the
During any chemical preparation, health
treatment used and the problems that arose
hazards must be known and corresponding
during the different essays depending on the
actions taken in order to prevent any risk. It is
types of matrix involved.
paramount to know the toxicity of the used
chemical agents, and the products that can be
created in various chemical reactions. Each
Acids: for dissolving carbonated matrices
chemical requires specific security equipment,
in sandstones
but as a rule, we perform the tests under a
ducted fume hood, and use personal protective
The carbonates that make up the matrix can be
equipment to chemical agents such as goggles,
dissolved by acids. Usually, the most commonly
Figure 3: Eggshells treated with acids. A) Acetic acid at 10%. The relief of the eggshell has been damaged and eroded. B)
Hydrochloric acid at 15%. The surface of the eggshell has been highly eroded (arrows). C) Oxalic acid at 10%. The relief of the
eggshell could be observed, but the surface was slightly altered (arrows) and the oxygenation channels could not be detected.
D) Sodium hexametaphospate (NaPO3)6 at 15%. The relief of the eggshell could be observed, its surface did not seem altered
and the oxygenation channels could be detected (arrows).
Journal of Paleontological Techniques