Placemats for quick acid/base tests on various household and lab-based substances. Printing: Print as many A3 size copies as is needed. I print 12 so every 2 students can share. Laminating is essential -Easy to wipe clean and reuse :) How to use: A piece of each paper or drop of indicator solution is placed into each square. Add a drop of each substance to their squares as indicated on the mat. Lab acids and bases should be diluted prior to testing. **Tip: **Eye-drop bottles can be purchased cheaply online for quick dispensing of the various substances - Game changer & HUGE timesaver in the long run!