the key in the begining in the lab leveal 8

i found everything but cant figure out how to get the key out of the jar

You have to add liquid from the test tubes in a specific order. I found the first one that made the liquid clearer, and then added another. If that made it dark again I restarted with the same one and tried over and over until I found the proper order of liguid from the test tubes.

i cant get the jar clearto get the key out

please help me get the key out of the jar