I want to try acid..

Well if you buy one blotter, it should only be about 1/2 a cm, even less size. You try one blotter, if you trip a fair bit from it it must be acid, as any other substance on one blotter wouldn't really do much.

 

a typical perfed acid blotter is 1/4 inch. which is .63 centimeters. its not "even less" than 1/2 centimeter.

 

if youve tripped out before theres nothing to worry about. just make sure youre in a good place, like usual. yes lsd and mushrooms are different, but most of their differences are subtle in my opinion.