How do you make photos black and white on snapchat?

When the picture's taken, you touch the pic to write like you'd normally do. Then you write the following:

B&w...

It's important that it's a capital 'B', a little 'w' and that you remember the 3xdots.

Good luck

B&w...
B&w...

B&w...

B&w...

B&w...