tools - How to identify paper which will blot fountain pen ink?

These days, with fewer people using a fountain pen to write, many notebooks/paper you find blotting the ink.

If I am at a store and contemplating to buy a notebook or writing/printing paper, how can I check if the paper blots or not? Most of time, it is not mentioned on the notebook or ream itself and I cannot test by writing on it. Please note that I am talking about office supply retail chains where the staff cannot answer in detail.

What is the best way to find out if paper of a notebook or paper will blot or not?

I am specifically looking for some physical attributes of the paper which I can check without starting a longhand penmanship.