Yes. Two practical options came up:

1. Use a camera app with more control. Many phones have third-party camera apps that offer exposure compensation and sometimes additional flash-related controls. Reducing exposure or changing how the app meters can help tame the flash effect.

2. Physically reduce the flash output with neutral-density material. A small piece of ND lighting gel/foil over the flash can cut the light without the red color cast you got from using a finger. Sample packs from lighting-filter makers are inexpensive and give you multiple strengths, so you can test what works best. You’d just need a simple removable way to hold the gel in place, such as a small wrap or sleeve that slides on and off.

Avoid improvised materials that add color or block the flash unevenly. A neutral filter material is the key if you want less flash power while keeping color reasonably accurate.