Just because your friend had the real thing and yours looks the same does not mean you got the real deal. Believe me I know it's happened to me.
I have seen a lot of fake Winny (Upjohn). Everything looked good, i.e. label, blue cap, seal on the box, etc..But they were fake and the only way you could tell was the way it seperates. The WAR book explains the seperation and how suspension is sold as Winny
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In any case, I will try to be more explicit in attempt to help you because I would hate to see you get fucked.
Shake the bottle. You should see a milky/bubbly foam on the top.
Put the bottle down and watch for separation.
If it separates right away (2min max) it's watered suspension.
If it does not separate within a few minutes check back in an hour. You should see the powder on the bottom and the clear white solution on the top.
If it did not sepqarate at all then you got yourself some suspension!! If you have a bottle of suspension look at it. The shit never separates. But, when it's watered down it does but rather quickly. The scammers who make the fakes know people are going to look for seperation. The timing of the separation is the only way to tell.
Also if you swirl the bottle you should see little swirls on the bottom while swirling. Those are the particles which seperate later on.
Hope this helps
Later