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  1. #1
    Pearl Enthusiast Senior Pearl-Guide.com Pearl Expert Pearl Dreams's Avatar
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    Default Jeremy: Natural White Hanadama-- bleached, or not?

    On Pricescope there is a thread about this. The conclusion on that thread seems to be that they are, in fact, bleached.

    Jeremy, could you please clear this up? I understand that the Natural White Hanadama pearls are not pinked.

    But are they bleached?

  2. #2
    Museum Pearl Senior Pearl-Guide.com Pearl Expert JerseyPearl's Avatar
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    Wow, really great question.

  3. #3
    Super Moderator Senior Pearl-Guide.com Pearl Expert jshepherd's Avatar
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    The real natural whites go through maeshori, but not traditional bleaching and pinking.

  4. #4
    Rare Pearl Senior Pearl-Guide.com Pearl Expert BAS's Avatar
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    Quote Originally Posted by jshepherd View Post
    The real natural whites go through maeshori, but not traditional bleaching and pinking.
    (Here we go again!)

  5. #5
    Pearlista Senior Pearl-Guide.com Pearl Expert GemGeek's Avatar
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    PP Natural Whites come from one grower, so you can be sure they are not bleached. If other sellers are calling their Hanadama pearls natural white, I couldn't say if they are unbleached or just not pinked. There is a big difference.

  6. #6
    Pearl Enthusiast Senior Pearl-Guide.com Pearl Expert Pearl Dreams's Avatar
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    The reason I posted the question is that there seems to be a bit of confusion over this. Yingh on the other forum posted:

    "I was chatting with Mia from PP (she is such a darling!) on Friday so I asked her. She said, natural white Hanadama are not "Pinked"; however, ALL AKOYA ARE BLEACHED to remove oyster tissue...."

    That made it sound as though they are, in fact, bleached for cleaning purposes. I had always assumed they are not bleached, but the PP site does not actually state this. So I'm thinking maybe they are.

    I just think people like to know what they have. Bleached, not bleached, whatever-- we just like to know. Jeremy says they receive maeshori. Does this include bleaching, Jeremy? If it does, so be it.

  7. #7
    Inactive Senior Pearl-Guide.com Pearl Expert
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    Bleach is an ambiguous term.

    The question being... is "bleach" exclusive to hypochlorite or peroxide agents? To that end, I say no.

    Oxidization is one thing, yet surfactants, alcohol, organic solvents, thermal degradation or ultraviolet treatments are something yet again. All may be considered bleaching, especially when the objective is to whiten or denature the microbial properties an object.

  8. #8
    Super Moderator Senior Pearl-Guide.com Pearl Expert jshepherd's Avatar
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    I will speak with her when she gets in, but all akoya pearls go through maeshori, which does remove impurities and even stains, but that and bleaching are two very different processes.

  9. #9
    Pearl Enthusiast Senior Pearl-Guide.com Pearl Expert Pearl Dreams's Avatar
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    Thank you for the clarification!

  10. #10
    Super Moderator Senior Pearl-Guide.com Pearl Expert jshepherd's Avatar
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    Quote Originally Posted by Lagoon Island Pearls View Post
    Bleach is an ambiguous term.

    The question being... is "bleach" exclusive to hypochlorite or peroxide agents? To that end, I say no.

    Oxidization is one thing, yet surfactants, alcohol, organic solvents, thermal degradation or ultraviolet treatments are something yet again. All may be considered bleaching, especially when the objective is to whiten or denature the microbial properties an object.
    I agree with this and this and it does create confusion, but there is a standard, nearly universal process that is only bleaching (see this photo from Kevin's site). This is what is considered bleaching at pearl factories - not maeshori.

    This is the standard pinking process.

  11. #11
    Pearl Enthusiast Senior Pearl-Guide.com Pearl Expert Pearl Dreams's Avatar
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    This is very helpful. Thank you.

  12. #12
    Rare Pearl Senior Pearl-Guide.com Pearl Expert CathyKeshi's Avatar
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    Thank you for the clarification, Jeremy
    Cathy

    CathyKeshi

  13. #13
    Natural Pearl Senior Pearl-Guide.com Pearl Expert amti's Avatar
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    Very cool pictures! Love the info this forum provides! Thank you all!

  14. #14
    Consumer Senior Pearl-Guide.com Pearl Expert kelluvpearls's Avatar
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    I found this article, are they describing maeshori accurately here?

    http://www.jewellerytechnology.com/e..._on_Pearls.php

  15. #15
    Consumer Senior Pearl-Guide.com Pearl Expert kelluvpearls's Avatar
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    There seems to be different type of maeshori treatments described in the article. Do you know which type was used for the Hanadamas?
    Also how about the Australian and the Burmese South Sea pearls? Thank you. This is interesting.

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