What pigment can be added to make the blue picture bright?

If you want to turn blue ink into dark blue ink, but at the same time ensure its brightness, I know you can add pure blue or phthalocyanine blue pigment to make the blue deeper and more saturated. If you don't need dark blue to be too bright, you can add a proper amount of black to make the blue look calm and rich.

Brown is recommended. Brown is any color between red and yellow. It is characterized by moderate dullness and moderate light gray. Brown, also known as brown, ochre, brown, brown, brown and so on. , is a color composed of a small amount of red and green, orange and blue or yellow and purple pigments. Dark skin color is suitable for hair color: gold, light brown and highlight. Because skin color is dark, try to use bright color. It is better to add highlights, but it is best to pay attention to the light brown color of highlights. Yellow skin color is suitable for hair color: burgundy, blue-black, dark brown, golden yellow or orange series colors are definitely forbidden areas for yellow skin, and this skin color is suitable for light olive. Red skin color is suitable for hair color: people with dark green, deep purple and dark brown skin color are not suitable for dyeing red or burgundy warm color, but suitable for cold dark green. Dark gold or dark brown is also suitable.