Will Buddha carbon varnish used for outdoor white marble guardrail turn yellow?

White marble will turn yellow over time. Reason: 1. White stone is exposed to alkaline water, and it rusts badly. Alkaline water can easily lead to the yellowing of white stone, because in alkaline solution, the redox potential of bivalent iron oxidized to trivalent iron decreases, and it is easily oxidized to trivalent iron by oxygen in the air. Iron trioxide, the component of rust. In practical engineering, many people ...