Dark wort - Iodine test

[Squid2015]

I was brewing a porter and attempted the iodine test. the problem, the wort was so dark, i could not accurately determine if starch was present. is there a better way to test for starch-to-sugar conversion?

 

[IslandLizard]

Actually, you want to test the grain particles for starch, not the wort/runoff. It's easier to see when you push the grain bits to the side.