Wow, there is just loads of useful advice on this thread.
Maybe its just me, but I always have some blue or orange snot/residue after snorting an Adderall (post-nasal drip). Don't tell me I'm not doing it right, it really isn't that complicated. It's your nose's natural reaction to drip a little after snorting a foot long line of adderall. Try wetting some toilet paper and wiping the inside of your nose to get rid of any residue. You could also blow your nose 30 minutes or so after snorting if you want to.
Again, this is just me, but I can't feel 10mg of Adderall. Most people can, but there is no general rule. The best thing to do is start with 10mg and work your way up 10mg at a time until you are satisfied. And besides, how in the hell can you inhale 50mg of adderall at once (I'm not saying you can't but you might have trouble breathing for a while)? That's like trying to inhale a big bag of flour or something. In case its not clear what I am saying, don't start with 50mg of adderall. I have personally seen someone take 5mg of adderall and have what looked to be an episode of mania for several hours. Now what would have happened if the person had taken 50mg?