If it's a "new" slab, you should assume if has Newton Rings to some degree. I have no control over this. If I could, I would. If Newton Rings are a problem... And I don't blame you if they are...
Please ask about them prior to making an offer/purchasing, and I will do everything I can to let you know the severity of the issue. Plus, many of the raw books we sell are LOW GRADE & FRAGILE and CANNOT HANDLE being transported back and forth multiple times without further degradation. Of course, if there is ANY issue with the condition of the item, if you don't agree with the grade, TALK TO US.
We're happy to work with you. But just changing your mind is no longer possible for us. There has to be a material issue... Sorry about that, but this year, we've had too many people just change their minds after the item was sent... And some of them didn't even open the item!
We apologize for any inconvenience this may cause, and we encourage you to dialogue with us.