Pink

a pale red colour
Pink is a nurturing, playful, and nostalgic color that takes people back to their childhoods. That said, pink is a color of opposites since it can make us think of both innocence and burning passion. Bright and hot pinks are associated with love, romance, and even lust. Intense pinks create a sense of urgency.
Pink represents unconditional love, love requiring nothing in return. It is also the color of friendship and conviviality. In the aura it signifies balance between the spiritual and the material.

Someone- Hey! Someone gave me a pink letter!
Second Person- Then someone might be having a crush on you! It's a love letter!