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Number of Petri Dishes
Posted: Mon Dec 04, 2006 1:36 pm
by Chili
Hi, if my child is testing five products on household bacteria, how many petris should I be figuring on purchasing? How many blotters can fit in a regular size petri dish? Should the control be in a separate dish? Thanks!
Re: Number of Petri Dishes
Posted: Mon Dec 04, 2006 4:17 pm
by LisaBug
You would want a positive (known baterial colony) and negative control (nothing but blotter) so 2 extra dishes separate from the 5 test products. So 7 in all.
Chili wrote:Hi, if my child is testing five products on household bacteria, how many petris should I be figuring on purchasing? How many blotters can fit in a regular size petri dish? Should the control be in a separate dish? Thanks!