How to tell if non-clumping litter has been used?

[md.as06]

So I'm relatively new to kitten care and bought some kitten-safe, non-clumping litter-- but it is quite dark and again, doesn't clump. I'm potty training the babies right now, so how do I tell if this is actually being used? Is this an example of a pee stain? (If the image doesn't work, there is a small patch of lighter and more dissolved litter in the middle)

 

[Caspers Human]

Rake the litter box like a Japanese Zen Garden:

You'll know, instantly, if your cats have been into the litter box since you were there, last.

 

[IndyJones]

You should be able to smell a faint pee smell. Also litter will be slightly off colour when it is moist.

 

[iPappy]

Also, you can check their bedding for any odor or wetness to make sure no one is having problems understanding where to go. If there are enough boxes, they'll catch on.

 

[Alldara]

Non clumping will usually kind of dissolve or fluff up. But the paper ones just look darker and have a smell.

 

[Antonio65]

If any cat steps on the litter it should leave at least one footprint on it, and you should see it.
Also, most litters track, so if a cat has walked on the litter, you should see some of it right outside the tray.