Sprout inhibitors are not always used so in many cases grocery store potaotes can be used for seeding. Yes if they are treated it is with chemicals usually Maleic hydrazide or Chlorpropham.

Here is a link that might be useful: Potato sprout inhibitors

They are treated in the fields with various treatments - see link below. Supplemental treatment may be applied in storeage. But the inhibitors don't prevent sprouting, just slow it so yes, stored potatoes will usually sprout - eventually.

There are many discussions here about using store-bought poatoes as seed potatoes in the home garden. The forum search will pull them up for you. It is a fairly common practice.

Dave

Here is a link that might be useful: Potato sprout inhibitors

Farmerdill and Digdirt - Dave,
THANK YOU for your information and links.
I have added "Sprout inhibitors" to my-words-of-wisdom-list.
Thank you again..... Lola