How to determine the calcium ion stability of emulsion?

First prepare a 5% calcium chloride aqueous solution: Weigh 50 g of anhydrous calcium chloride with a 1% balance, add 950 ml of water to shake well, and set aside. In a 10 ml graduated test tube, use a dropper to add 5 ml of emulsion, and then add 1 ml of 5% calcium chloride solution. Pay attention to adding slowly, place it on the test tube rack after shaking well, and observe after 1 h, 24 h, and 48 h respectively. If there is stratification, precipitation, flocculation, etc., it is considered unqualified.
Since the emulsion is added to the test tube first, and then the calcium chloride solution is added, there will be a local high phenomenon at the contact surface of the two liquids, so you can weigh it with reference to the above ratio, stir it and place it in the test tube.
Some emulsion manufacturers set the concentration of calcium chloride in the stability of calcium ions to 0.5%. Since there is no national standard for architectural coating emulsions, the standards of each factory can only be used as the implementation standard.