Mix red and green until you get the desired yellow shade
Use red paint and yellow paint to adjust warmth (more red = warmer yellow, more red-green balance = closer to orange)
Use blue paint and yellow paint to adjust toward a greener yellow (add small amounts of blue carefully)
For digital color: set RGB to 255, 255, 0
For digital color: set CMYK to 0, 0, 100, 0
For watercolor/gouache: start with a base of yellow and tint with tiny amounts of red or green as needed
For mixing lights (RGB): combine red light and green light at full intensity to make yellow light
For fabric/dye: use yellow base dye and blend with small amounts of red (for warmer) or green (for greener)