Flosstube 72- new challenge unlocked

the color I'm missing is 912. really should have checked the number of stitches I'd need of it back when I was buying all the colors, but I am kinda enjoying this challenge. 
on the bright side, in looking for how many more skeins I'd need of this color I calculated how many stitches I can get out of each skein, and found that I only need one more skein of this color. 
I'd also need more black (310) eventually, so I migh just wait until I run out of that too before I actually go shopping. this one is defeintely going to need multiple buys, cause I'm not gonna get 20+ skeins of this one color at once when I can space them out.