 So there's a lot of talk lately about acid-free products. Now on what basis are products defined as acid-free? Well, it's all about the formula. So if there are no acidic components in the formula, it is basically an acid-free formula. So look for ingredients like acrylic acid or metacrylic acid, and what they do is actually they chemically corrode the nail plate so they form little holes or micro-grooves for the gel to hold onto the nail. Now what you should not confuse this with is pH value. People think acid is probably a very low pH, that's not the case, because gels do not have any water inside, and pH is only used for measuring the acidity of an aqueous solution. So we are not talking about that. So now how can we check if our product contains acid or not? Well that's really very simple because in Europe we need to apply the correct rules for the labels and you will find this on the label in the inky list. The inky list will give you all the ingredients and if it has acid you should find it there. Now sometimes it is also mentioned specifically on a product if it does not contain acid. For instance, to give you the choice between a product containing acid and a product containing no acid, in which case it stays clearly acid-free formula. If this is not mentioned on the label then this should not be the case but then I would advise you to contact the supplier of your products.