Answer:
1.The researchers let it boil for about 45 minutes until it was melted. Then, it was transferred to a metal container. After 7 minutes, it was exposed to the air in order to harden.
2.This butter derived from marang seed is a process of recycling. This is also to show the varied use of marang fruit.
5.Cigarette filters with acetone are not acceptable as a source of glue.