wetness indicator

From wetness +‎ indicator.

wetness indicator (plural wetness indicators)

1. A graphic on the rise (front) of a disposable diaper that fades or changes colour when the diaper is wet.
   • 1980, Charles D. Schewe, Reuben M. Smith, Marketing: concepts and applications‎^[1], McGraw-Hill, →ISBN, page 10:

     The wetness indicator is a toy block design on the diaper, its colored letters lighten as the inside of the diaper goes from dry to very wet.

   • 2008, Chapal K. Das, Sandeep Kumar, and Tanmoy Rath, “Vinyl Polymer Applications and Special Uses”, in Munmaya K. Mishra, Yusuf Yagci, editor, Handbook of Vinyl Polymers: Radical Polymerization, Process, and Technology, 2 edition, CRC Press, →ISBN, page 577:

     Wetness indicators are increasingly used in diapers to help with visual check. Adding PVA 64 to hot-melts used for diaper assembly has become a true asset in this field due to its capability to carry the moisture to the wetness indicator. When the diaper becomes wet, PVA 64 carries the humidity to the wetness indicator, which changes in color, indicating that the diaper needs to be changed

   • 2025 February 13, Sarah Dawson, “Fred & Flo Cottony Soft Newborn Nappies: Review from a mum of two”, in Women’s Health‎^[2], Hearst:

     The parent-friendly features, like the clear wetness indicator at the front of the nappy and the colour-coded fit guide, make it easy to know your baby's nappy size and when they need a nappy change.