Okay. I'm just unaccustomed to the need to specify silver when referring to the color variety Colombian. But it makes sense that you'd need to for genetics talk.“Columbian” the variety is silver based. Columbian in terms of genetics just refers to the pattern, not the specific silver version of the pattern. For example, buff brahmas are buff columbian, and RIRs are pretty close to red columbian (they lack the black neck feathers, so are specifically black tailed red, which is pretty close to columbian)