theory11 — Magic Tricks & the World's Finest Playing Cards

The pass


Without seeing your pass or knowing which one you're using, it's hard to say. On a general basis I'd say it's a matter of practice. Also, it pays to misdirect when you're doing it so you don't have to worry quite as much about how it looks.
 
The actual pass itself is not supposed to be fully invisible. There will ALWAYS be a flash, no matter how tiny, because there is always line of sight to the cards when the packets transpose. It's just a matter of misdirecting their eyes/covering the pass with an action.
 
Hello ZaidA! The pass is not meant to be invisible and with a little practice and misdirection it will be less visible to the spectator. Hope this helps and have a good day!
 
It makes it better if you have them make eye contact with you when you do it, (you can literally swing cut the deck and they wouldn't notice) it also helps to use a borderless deck like bees or something similar.