Have you noticed that some of the "postcards" are accented with the colour red, and others are just black and white?

RED

Sailor's Crossing
- Elf victim (blood)
- Flaming Fist guard (coat)

Fisher's Wharf
- Drusilla's scarf and tools

The Blushing Mermaid
- Selwyn (writing pen, hat and cheeks)

Morgue
- The dead elf (blood)

Blade and Stars
- Half-orc victim (blood)

Baldur's Mouth
- Newsie's shirt

Silver Crescent Beach
- Tarp (blood from the dragonborn)

Canary Lane
- "Magpie"'s coat
- Letter's wax seal


UPCOMING WITH RED ACCENTS
- Insight Park (blood on the ground)
- Harbormaster's office (map)
- Saint Sollar's Way (Leventide's wife belt and Ilmater's hands behind her)
- Sorcerous Sundries - cuppola's glass



BLACK & WHITE ONLY

- Cliffside Cemetery
- Misty Court
- Trident Lane (automaton and their tools, also in black and white)
- Shrine of the Suffering
- Seatower of Balduran
- Locklee Street (the PC's home)

UPCOMING WITH BLACK AND WHITE
-Eastway Expeditions




What if this is a visual cue from the designers to hint at which locations would allow us to solve the crime more quickly?
Within the inventory, the "neutral" item is black and white (the invisibility potion) while the two items related to the crime are clearly red (the wax seal from M's letter, and the dragonborn's dagger).