What are practical ways in which Kemach Yoshon (old flour) is certified?
What does "Winter Crop Wheat" and "Spring Crop Wheat" refer to? How does that apply to Kemach Yoshon?
If one is being careful with the laws of Yoshon, is it true that soy sauce, soy milk, beer, and whiskey could present an issue?
Are there some products more likely to be Yoshon certified than others? Why?
Regarding hechsheirim that certify Kemach Yoshon; if the flour is stored for an extensive period of time, does that present a problem of worm infestation?