How do you type words on powder game

1. Select "TEXT"
2. Click where you want to start typing on the screen
3. Type text*
4. Click outside text box to make it disappear

*Right-click on the dust you want to type with. The default is powder. Different types of text do different things after you finish typing.
Elements that fall, fall after typing (powder, water) and elements that stay put, stay put after typing (metal, C-4). Elements that spread, spread after typing (gas, cloud) and elements that spread then disappear, spread and disappear when typing (fire, spark).

Exceptions:
Laser disappears after typing
You cannot type with glass
Typing with bubble makes steam which acts like fire after typing