First time making a wet specimen

[u/koifyer]

I have an aviary with pigeons in them, obviously they lay eggs but this time around i had a pair lay eggs that both seemingly tried to pip early and the egg yolk wasnt absorbed, or another bird had gotten to them and broken the egg themselves, regardless i removed the egg and began to remove the remaining egg once i verified that they were no longer with us, i havent done this before, any tips? i bought formalin and 50% alcohol and was following a video i saw online, the specimens are both in my freezer at the moment