Ok, I have my very first pet snake and at that, it was an accident because he had to have BEEN someone else's snake before. To find a four foot butter corn in a parking lot is like winning the freaking lottery. LOL! BUT, my brother raised snakes for about 20 years. The ONLY thing he use was newspaper and there were never any problems with ink or anything else. When I found this snake, I did what I had learned watching my brother and I put a layer of newspaper on the bottom of the viv and then I shredded newspaper and put it all through the viv. He seemed to be very happy in just that. Now, in getting advice about all kinds of things on here, people kept talking about the aspen. So, I got some to see if he liked it. I still have a layer of newspaper on the bottom of the viv because snake feces is VERY watery and I don't want him burrowing through a mess (the aspen is very absorbant though) but just in casers, I like the paper. It's a matter of taste. But I will tell you that this snake LOVES the aspen. He burrows all over his viv and pokes his head out and seems to be very happy that he can hide his whole body down in the stuff when he wants. It is relatively inexpensive and makes your viv look nice.
I have found that at the pet stores, unless they actually own a snake, they don't know much about them and will sell you anthing. I was asking a guy at a store that had snakes about some things for Billy's viv. He was telling me they had four snakes for sale there in the store and told me what kind. He said they had a king snake and I asked him if it was a Scarlet or a Florida King and he said, "I don't know, it is black with yellowish stripes on it.." I explained that it was a Florida King and went to look at him. Beautiful snake but not very bright pet store guy. Um, hello, if you are going to sell it, don't ya need to know what it is? Hehehehehe... I would have understood if it had been a big store and not his dept. but this was a tiny store and it WAS his dept. Oh gosh!
I went off on a tangent, sorry... If you want to use newspaper, use it, but the aspen is awesome I have found.
Good luck!