1. how is the qualitythe qualities of most products are above 99% purity, same are 99.9% purity.2, how is the packagefoil bag or as customer's required.3, how is the storagekeep in dry and cool place.4, do i need to pay extra for shipping costno, our price includes the shipping cost already; you need not pay for any tax and others.5, can i order sample to testyes, you are welcome to order sample before placing bulk order. we will send the sample directly to your door by courier.6, minimum quantityusually our minimum quantity is 50g. but you are welcome to order samples to check the quality and our service.