Sand, significant in the final colour of the concrete, came from a single source and was stored at the local producers to ensure maximum uniformity of colour.
沙子对混凝土的颜色有重要影响，采场单一、由本地的生产商负责以保证颜色最大的均匀性。
2
Microscopically visible particles differ in colour, texture, uniformity and in water solubility and absorption.