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Thread: Safety of Chemicals

  1. #1 Safety of Chemicals 
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    Hello all.
    I am trying to find out if anyone can advise of the safety limits(if tested) on 2-hydroxypropanoic acid(lactic acid) i will be using it to remove tattoos using a make up tattoo machine. i understand that 100% could possibly burn the skin. the research i have found for the correct mixture is to mix with Distilled Water. Now no one has been able to to tell me the percentages of the mixtures. (believe they are just trying to keep it secret to prevent me from using the same liquid.) im leaning more to the mix of 70% lactic to 30% distilled. would that be harmful i dont know. :/

    if anyone can help that would be fantastic.


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  3. #2  
    Moderator Moderator Cogito Ergo Sum's Avatar
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    If my calculations are correct, then 1L of such a mixture (70% lactic acid, 30% dH2O) will have a pH of 1.44.
    Administering such a solution on the human skin results in at least 2nd degree skin burns.


    "The only safe rule is to dispute only with those of your acquaintance of whom you know that they possess sufficient intelligence and self-respect not to advance absurdities; to appeal to reason and not to authority, and to listen to reason and yield to it; and, finally, to be willing to accept reason even from an opponent, and to be just enough to bear being proved to be in the wrong."

    ~ Arthur Schopenhauer, The Art of Being Right: 38 Ways to Win an Argument (1831), Stratagem XXXVIII.
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  4. #3  
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    Home made tattoos are bad enough. (But if you don't mind clumsy. ugly skin adornments with the risk of infection that's your lookout.)

    Amateur tattoo removal sounds like a recipe for disaster.

    I'm sure there are Product/Material Safety Data Sheets for both the equipment and for the chemical/s you might use. Material safety data sheet - Wikipedia, the free encyclopedia

    You'd be best advised to check these out and to look for a professional who can either do this for you or help you do it safely.
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  5. #4  
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    thanks for your reply Cogito Ergo Sum and Adelady.

    Cogito - thats interesting as some of the beauty products that use lactic acid are using 70%. But i think my best bet will be obtaining a PH tester and match it to the PH of the skin. ???? i will be consulting a dermatologist to see if they have any suggestions.

    Adelady - im going to be making sure i have all possible training before i begin. just the companies that are currently doing it will only give all info if you go into a franchise with them. im sure i will be able to obtain all relevant info. this post was basically self research.

    many thanks again.
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  6. #5  
    Theatre Whore babe's Avatar
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    I have no tatoo's.....I didn't want them to grow old WITH ME! *L*
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  7. #6  
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    Quote Originally Posted by woodylester View Post
    Cogito - thats interesting as some of the beauty products that use lactic acid are using 70%. But i think my best bet will be obtaining a PH tester and match it to the PH of the skin. ???? i will be consulting a dermatologist to see if they have any suggestions.

    First of all, you are welcome.

    Yes, but beauty products are a mixture of different chemicals, designed for the human skin.
    Your idea was simply combining lactic acid with dH2O. The result would mutilate the skin.
    "The only safe rule is to dispute only with those of your acquaintance of whom you know that they possess sufficient intelligence and self-respect not to advance absurdities; to appeal to reason and not to authority, and to listen to reason and yield to it; and, finally, to be willing to accept reason even from an opponent, and to be just enough to bear being proved to be in the wrong."

    ~ Arthur Schopenhauer, The Art of Being Right: 38 Ways to Win an Argument (1831), Stratagem XXXVIII.
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  8. #7  
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    Ph of the skin? Ph, perhaps, of the liquid components of the skin. BTW, does Ph necessarily guarantee the corrosivity, or lack thereof, of a given liquid? (Ph=1.44). Ph of lemon juice is......? People can bathe in it. Or, drink down some "distilled water", Ph = ~ 5.0, likely it'll eat out your guts! jocular
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  9. #8  
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    I have a dermatologist.

    She recommends different products on the individuals skin.

    It works.

    I look 15!!! (joking)
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  10. #9  
    Moderator Moderator Cogito Ergo Sum's Avatar
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    Quote Originally Posted by jocular View Post
    Ph of lemon juice is......? People can bathe in it. Or, drink down some "distilled water", Ph = ~ 5.0, likely it'll eat out your guts! jocular

    The pH-scale does not work that way. It is more complicated than that.
    "The only safe rule is to dispute only with those of your acquaintance of whom you know that they possess sufficient intelligence and self-respect not to advance absurdities; to appeal to reason and not to authority, and to listen to reason and yield to it; and, finally, to be willing to accept reason even from an opponent, and to be just enough to bear being proved to be in the wrong."

    ~ Arthur Schopenhauer, The Art of Being Right: 38 Ways to Win an Argument (1831), Stratagem XXXVIII.
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  11. #10  
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    Quote Originally Posted by Cogito Ergo Sum View Post
    Quote Originally Posted by jocular View Post
    Ph of lemon juice is......? People can bathe in it. Or, drink down some "distilled water", Ph = ~ 5.0, likely it'll eat out your guts! jocular

    The pH-scale does not work that way. It is more complicated than that.
    More complicated than what? It simply consists of a measure of the H+ ions in a solution, what is complicated about that? jocular
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  12. #11  
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    Quote Originally Posted by Cogito Ergo Sum View Post
    Quote Originally Posted by jocular View Post
    Ph of lemon juice is......? People can bathe in it. Or, drink down some "distilled water", Ph = ~ 5.0, likely it'll eat out your guts! jocular

    The pH-scale does not work that way. It is more complicated than that.
    Please explain to me.
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  13. #12  
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    In English.
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  14. #13  
    Moderator Moderator Cogito Ergo Sum's Avatar
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    Quote Originally Posted by jocular View Post
    Quote Originally Posted by Cogito Ergo Sum View Post
    Quote Originally Posted by jocular View Post
    Ph of lemon juice is......? People can bathe in it. Or, drink down some "distilled water", Ph = ~ 5.0, likely it'll eat out your guts! jocular

    The pH-scale does not work that way. It is more complicated than that.
    More complicated than what? It simply consists of a measure of the H+ ions in a solution, what is complicated about that? jocular

    I am afraid I misunderstood your post.
    I thought that you were simply subtracting the pH of lemon juice from the pH of pure water, which would explain why you mentioned pH = ~ 5 in your post.
    My reply was merely suggesting that you cannot calculate the final pH of diluted lemon juice by simple arithmetic.

    Quote Originally Posted by babe View Post
    Quote Originally Posted by Cogito Ergo Sum View Post
    Quote Originally Posted by jocular View Post
    Ph of lemon juice is......? People can bathe in it. Or, drink down some "distilled water", Ph = ~ 5.0, likely it'll eat out your guts! jocular

    The pH-scale does not work that way. It is more complicated than that.
    Please explain to me.

    It is already explained by member PhDemon in post #10.
    "The only safe rule is to dispute only with those of your acquaintance of whom you know that they possess sufficient intelligence and self-respect not to advance absurdities; to appeal to reason and not to authority, and to listen to reason and yield to it; and, finally, to be willing to accept reason even from an opponent, and to be just enough to bear being proved to be in the wrong."

    ~ Arthur Schopenhauer, The Art of Being Right: 38 Ways to Win an Argument (1831), Stratagem XXXVIII.
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  15. #14  
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    Quote Originally Posted by Cogito Ergo Sum View Post
    I am afraid I misunderstood your post.
    I thought that you were simply subtracting the pH of lemon juice from the pH of pure water, which would explain why you mentioned pH = ~ 5 in your post.
    My reply was merely suggesting that you cannot calculate the final pH of diluted lemon juice by simple arithmetic.
    My apologies! I was misleading by being facetious, which is poor protocol for a science forum. I did that to provoke someone who, like myself, has always taken the textbook definition of "pure water", such as distilled water, as having Ph=7.0. Open distillation exposes the water to atmospheric air which always contains carbon dioxide, which dissolves in the water, thus lowering it's Ph to as low as 5.0. I was amazed the first time my Ph indicator showed an acidic condition for my distilled water! jocular
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