you check the total amount of desolved sugars in the juice, when it reachs a certain level typical of the variety (for example 18%) its good to go.
You know when french onion dip has gone bad because it has water on the top.
when it does not work
you know when you are not cotrolling the car.
I only know one. Grapes and raisins- DO NOT feed to dogs at all.
check it
If you eat it and then throw up. ;)
Grapes are fine but chocolate is a NO!
If it is stale and a very light brown and nothing grows on top of it, then you know you have bad soil.
no
all grapes are bad for dogs!
It as a dark color and it emits a bad order that is easily recognizable
It will probably smell bad or have a noticeably weird flavour to it.