Eggshell calcium (question for lovejoypeace)

Hi,

I want to make sure I made this alright ...

I made myself some eggs and saved 3 eggshells ... then I used water to 'attempt' to clean some of the stuff on the inside of the shell out (but there was some of that 'skin' left in there.

I think heated the egg shells in the over at 350 for like 8 mins.

Then I took them and put em in a bowl and squeezed 4 lemons in there ...

#1 So is that how you make yours?

#2 What about salmonila etc did I need to do another step to make sure I dont get salmonila or something along with the eggs?

#3 anything else?

thanks