| 摘要 |
<p>The method marks positions on a base to be covered by a layer of hardening material, so as to install equipment later. A dye is applied to the position to be marked, and becomes visible by diffusion through the covering material. Diffusion can be caused by the effect of moisture, while the dye can be a watery solution of an intensive one. It can be impregnated into a support glued into place.</p> |
