For your Maternity Hospital :) This is to test the amniotic fluid for pH balance. It's good to have this on hand for early detection of possible complications. There is a color chart on the back of the bottle for your reference. This test involves putting a drop of fluid obtained from the onto paper strips containing Nitrazine dye. The strips change color depending on the pH of the fluid. The strips will turn blue if the pH is greater than 6.0. A blue strip means it's more likely the membranes have ruptured. Please click "Try It" to view this item in 3D! I sincerely hope you enjoy this as much as I have enjoyed creating it :) Remember, your reviews are my power, so if you love it, don't forget to show me some love :) Coordinating items for this collection are sold separately and can be found in my catalog :) Please refer to catalog icon for your purchase :) no refunds :)