Ok well I don't know much about an universal indicator since I started learning about it today in class if it has many uses or not, I don't know but it could be fun to use and can be put under "tools" tab its mostly used to indicate the element example carbon dioxide would turn it orange-red color. The indicator can be solid or a liquid it depends on the element to be used on it. Yes I know we have icons and signs saying what the element is but it could be fun to use the indicator and it may be used in new creations to create well something interesting.

Well no I mean a universal indicator is a word from my language so I pressumed it would be called that but anyway I mean like its used to indicate for example if its carbon dioxide or oxygen ex if you pour dry ice into the universal indicator (liquid) then it would turn orange-red when its original color was yellow