What are some of the ways to detect the various levels of quality of bi luo chun? I've looked at various ones--shape of leaves (degree of curliness), color, aroma, and of course the taste of the brewed liquor. But how would (or do) you judge the quality of bi luo chun? I ask this specifically because it's one of my favorite greens and I know I'll buy more in the future. I want some ideas as to which are best in your opinions (i.e. buying sources online) or ways to judge the quality in person (local shops, etc.).