Chemical blocks herself.
1- Show the needle your the boss. : Possibly referring to showing Tonka (uni) that she's the boss.
2- We can mix two different threads. : Two different colors, red and black. Also could be referring to actual threads in Helovia in which she is threading with two differents currently.
3- The thread your using is a combo of two. : Kumal thread is closed and only for the Assassins.
Isn't it pretty? - fluff