I bought my first 2.5 gallon jug of chlorine from Pinch a Penny today and when I busted it out I noticed something was missing....the smell of bleach! It is completely odorless and dark yellow like urine.
Just dip something in it (like a kitchen knife) and then rinse it into a glass and test it. You'll know instantly if there's chlorine in there or if it all broke down into expensive salt water. If you want to test percentage and not just see if it's present: Chlorine Date Code Decoder/Easy Way to Measure Strength.
Update: the odorless liquid chlorine from Pinch a Penny has been keeping my FC levels on point, so it is working. I also spoke with an employee there and they assured me that there should be no odor to the bleach unless it touches a contaminate.
Bleach/chlorine definitely has a smell. It's not overly strong and is not that overwhelming "pool smell" people often associate with chlorine but there is a unique chlorine smell to luquid chlorine. Definitely not "oderless"!