In the workshops of the Archaeological Museum in <a href="https://en.wikipedia.org/wiki/Gottorf_Castle" class="extiw" title="en:Gottorf Castle">Gottorf Castle</a> there is a facility for <a href="https://en.wikipedia.org/wiki/Freeze-drying" class="extiw" title="en:Freeze-drying">freeze drying</a> in a vacuum of damp objects.
<a href="//commons.wikimedia.org/wiki/User:Nightflyer" title="User:Nightflyer">Nightflyer</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>