Erythematous simply means red, so an erythematous streaks are red streaks.

Blonde, occasionally with a couple of dark streaks, but its usually darker blonde streaks not brunette streaks

what causes black streaks on thumbnail

Subtle erythematous streaks of the mucosa refer to small, faint red lines or streaks seen on the mucous membrane. These streaks may indicate minor irritation, inflammation, or increased blood flow in the area. It is important to monitor for any changes or symptoms associated with these streaks and consult a healthcare professional for further evaluation if needed.

You can do it at home. Just boil kool-aid and then put it in your air and you will have colored streaks