how does formalin compare to wardsafe or carasafe?

[cartwrighta]

I believe the carasafe is 50% stock.

Will they all work as long term perservatives? I'm looking to preserve numerous chicken embryos in various stages of development.

Thank you.

[b_d_41501]

Fixation involves the chemical alteration of protein to prevent breakdown. Dilute formalin solutions are most effective as fixatives. Preservation is the process of maintaining the state of fixation. Formalin-free "holding solutions" like WardSafe are good for preservation.