As you can understand it by the name, no color pin means there is no color fills on it. Its metal color comes from dyed color or plating. Since color dye is quite simple so plating technical is the most important factor to create a perfect no color pin.
Since there is no enamel color or color paint on surface, plating coating is the only coating to protect pins from rust and oxidize. If plating incorrectly , pin’s plating coating will be worn down and plating color will be fade off.
It’s quite often that we receive complaints from many new clients. They made pins from other pin makers and asked me why his gold plating pin becomes silver plating after just 2 months. Become white plating pin to be more precise. Yep, the plating coating is fade off that’s the damn reason. Choose pin maker wisely bro.