A tinge is a slight amount of something, like a color or a feeling. Some glaciers have a tinge of blue, and an old photo might make you feel a tinge of sadness.
If a painting has a tinge of orange, there's just a touch of orange. Outside of colors, tinge can mean a small amount of just about anything. Sometimes you hear about someone speaking with a tinge of anger. That means there's just a little bit anger showing in their words. A tinge will never bowl you over — it's always small or subtle.