Snapchat allows you to apply filters to your images before sharing them with your contacts. This tutorial explains how to send a photo in black and white with Snapchat.
Enabling the Black and White Filter
Open
Snapchat and tap the round button to take a picture:
Once done, swipe left or right across the screen to navigate through the filters:
Repeat the operation until the
Black and White filter appears:
Photo: Unsplash