Tinted pink for identification purposes only.
Due to the fact that Davidson's solution contains sea water, it is an excellent choice for preserving the structure of the tissues.
Reference on use:
OIE. June 2019. Manual of Diagnostic Tests for Aquatic Animals.
CEFAS. November 2017. Molecular characterisation of an endozoicomonas-like organism causing infection in King Scallop (Pecten Maximus L.). Page 10.