Tea producers can't all sell just the first cut - so they blend new with middle and also some last cuts. The unscrupulous companies will show the best and deliver the rest.
Some unscrupulous tea suppliers have found a sneaky, cheap way out. They add a chemical to imitate the flavor of good jasmine tea.
Yin Na is an expert at testing and not easily fooled. We have to be vigilant sourcing the best product for the best prices.