Aside from asking others if they can pick up your scent, how do you reliably test projection and sillage? And, what is the actual difference between the two terms? After my typical spray routine, I am confident that I have created a scent bubble around me because I can smell it coming off both shoulders, etc., but that doesnât necessarily mean itâs pushing out beyond 6-12 inches. Without asking someone or getting a compliment, how do you know? Just curious if the brotherhood has any tips when it comes to testing projection and sillage.