Talk:Existing Technology/@comment-188.97.121.243-20170607113445

Make the silver backers names written in thermochromic ink. The wall can have a grid system, so each backer knows the position of their name, and with a wand, they can touch the position of the name, which switches a small heating element behind the ink, which turns the ink visible for a certain amount of time. You can obviously have admin switches that switch on all heating elements﻿ for demonstration