A Shuang designer's color for joints

Quick answer：

A Shuang is likely a designer who specializes in creating color schemes for joint sealing, which is a technique used in construction to fill gaps between tiles or similar materials. The term 'joint sealing color' refers to the specific shades or hues used to ensure the aesthetic and functional integrity of the sealed joints. This involves selecting colors that complement the materials being used and match the desired aesthetic of the space.