i don't know where some of these people are getting the info they're giving out, but seed size and markings mean absolutely nothing. some strains just have small seeds. having tiger stripes doesn't make a seed better than another. light colored ones are usually immature, but even color can vary among mature seeds depending on the strain. basically if you can put the seed on a hard surface and press it with your finger and it DOESN'T crush, it's probably mature and viable. a while back i had subbed to a thread where the guy was supposed to experiment to study seed sizes and if there was anything to be learned by it, but he stopped posting here.