That's an excellent initiative! Using highly visible public waste bins is a proven strategy to encourage proper disposal. For maximum impact, consider these bright color options:
Safety Yellow (or High-Vis Yellow): This is arguably the most effective color for visibility. It's universally associated with caution and attention, used on safety vests and signs. A yellow bin cuts through visual clutter in any environment, from parks to city streets.
Neon/Florescent Orange: Incredibly eye-catching, especially in both daylight and under artificial lighting at night. Orange often feels friendly and approachable, which can subtly encourage use.
Vibrant Green: Particularly effective for promoting eco-friendliness and is often linked with recycling. A bright lime or kelly green stands out against natural and urban backgrounds.
Electric Blue: A less common but very striking choice for waste bins. Blue conveys cleanliness and responsibility, and a bright cobalt or azure shade will pop against most surroundings.
Traffic Cone Orange: Similar to neon orange but with a specific association with public space and utility. People are conditioned to notice this color.
Pro Tip: Combine a bright base color with high-contrast, bold lettering (like black or dark blue) that clearly states "TRASH" or "RECYCLING." For even greater visibility, consider bins with reflective tape strips or built-in LED lighting for nighttime use. The goal is to make the bin an unmistakable landmark, reducing litter and keeping your community clean.