As you are the expert:
What impurities can reside in the end product? As mentioned before, impurities can cause problems in the lungs and they differ from batch to batch. I had once an A-php from a very professional source which didn't cause any problems, so it's not a problem with the desired product.
I am Taiwanese and I don’t understand English. I use a translator to talk to you. I need simple equipment and recipe materials. All of them have been purchased. The 1-10 kilograms of ethyl acetate ice in the video of my study only has a small amount of crystallization when freezing. I need simple equipment. I am willing to pay USDT for the recipe. Thank you.