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.
And there is a way to do this with xylene.... Rumour tells that you get biggest crystals with xylene but you also must wash that on 3 times on syntesis by acidifying HCl and raise pH with NaOH to 9.4(??) and then down to 5.5 with HCl or i heard that you can use CH3COOH (Winegar acid(?)) OR JUST HCl but CH3COOH pH WOUNT GO UNDER 5 SO EASY
Then acetone on mixture and bake it on acetones boiling point.
And to freezer on 12h