Short version: Would people who have Disodium EDTA (I really do mean Disodium, not Tetrasodium!) do me a favor -- would you please try to dissolve Di EDTA in the lye solution you use for your next soap batch and report back? Some questions I have for you -- Does the Di EDTA dissolve easily in your lye solution? If you use a lye solution that is 35% NaOH (or KOH) or stronger, does the lye solution remain clear after adding Di EDTA? Do you have any observations, comments, tips, or tricks about using Di EDTA? *** Long version: Suppliers of soap and cosmetic ingredients may sell two forms of the chelator EDTA -- there's Disodium EDTA and there's Tetrasodium EDTA. Tetra EDTA is highly soluble in plain water, so it's easy to use for many hand crafted bath and beauty products such as soap, lotions, etc. Di EDTA, on the other hand, is not nearly as soluble in plain water. For this reason, many of us who use EDTA prefer to buy the Tetra version. Unfortunately, it's easy to forget there are two versions and purchase Di EDTA by mistake. In a recent thread, we discussed if and how Di EDTA can be successfully used if that's the version a person happens to have. See https://www.soapmakingforum.com/threads/how-to-make-tetraedta-in-39-solution.72729/ The key to dissolving Di EDTA is to dissolve it in a high pH (alkaline) solution, not plain water. So that got me to thinking -- any lye solution that would be used to make soap will have a much higher pH than is strictly needed to easily dissolve Di EDTA. So why not add Di EDTA powder to the lye solution and then make soap as normal? Problem is -- I don't have any Di EDTA to test this theory, which is the reason for this thread. Carolyn (@cmzaha) says it works for her to dissolve Di EDTA in the lye solution she plans to use for soap making. She reports it just dissolves without any trouble. Would others who have Di EDTA do me a favor -- would you please give this a try and report back? Does the Di EDTA dissolve easily in your lye solution? If you use a lye solution that is 35% NaOH (or KOH) or stronger, does the lye solution remain clear after adding Di EDTA? Do you have any observations, comments, tips, or tricks about using Di EDTA? More info: What is a chelator: https://classicbells.com/soap/chelator.html Using tetrasodium EDTA in soap: https://classicbells.com/soap/EDTA.html Using disodium EDTA in soap: Use the same dosage by weight as Tetra EDTA. (See link in the line right above.) You can use KOH or NaOH solution for dissolving Di EDTA.