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Q: What does a negative test for Sudan 3 show?
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Why use Sudan 3 to test for fats?

It is used to indicate any presence of fat in the substance you are testing and if there is any present it will change to a different color.


Well 3 hits of weed show up after 3 weeks?

Probably not, THC is stored in your fat so the more fat you have the longer it sticks around. If you aren't a regular user you would usually test negative after two weeks. If you really want to make sure, take a home test.