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Pampers make diapers which have a wetness indicator. Initially it is a yellow stripe when dry; when wet it turns blue. I am wondering whether this would be considered tzoveha.

http://g-ecx.images-amazon.com/images/G/01/aplus/detail-page/B00DFFT8AU_pampers_201306244_4627_lg.jpg

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Seems like that dying is incidental to its use, and not the purpose of the diaper... unless you plan to make pediatric urinary art. –  Charles Koppelman Sep 16 '13 at 2:16
    
i had this question yesterday as well! –  bondonk Sep 16 '13 at 19:37
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1 Answer

The Star-K's Rabbi Frankel discusses it.

Rav Heinemann shlit”a suggests that there is further reason to be lenient in the case of the diaper with a color-changing stripe. Rav Moshe Feinstein zt”l states that, on Shabbos, one is allowed to wear photo-gray glasses which darken when exposed to sulight, even though walking outside will cause the lens to change color. ... Similarly, any color change which results from diapering a baby would not be classified as tvziah, as this is not the derech of the melacha. If so, it could be argued that even a person who desires the color change feature would be permitted to use the diaper on Shabbos.

Nevertheless, Rav Heinemann paskens that someone should preferably not use such a diaper on Shabbos if it was bought particularly because of its color changing feature. He may, however, use such a diaper if this particular feature is insignificant to him.

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Interesting. In Kashrus Kurrents - Nov 2009 the Star-K says it should not be used. Did they change their mind? –  Gershon Gold Sep 16 '13 at 15:14
    
Yes they did change their mind per Matzav.com. –  Gershon Gold Sep 16 '13 at 15:19
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