A coupon was immersed in drinking water for almost one to two months. A thick deposit was observed on the coupon which was removed and placed over a glass slide and observed as a whole under foldscope.


 <img alt="1" class="alignnone size-medium wp-image-85475 gcloudimg" data-attachment-id="85475" data-comments-opened="1" data-image-meta='{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}' data-image-title="1" data-recalc-dims="1" height="300" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_85473/1-13.jpg" width="225"/>
 <img alt="2" class="alignnone size-medium wp-image-85476 gcloudimg" data-attachment-id="85476" data-comments-opened="1" data-image-meta='{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}' data-image-title="2" data-recalc-dims="1" height="300" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_85473/2-11.jpg" width="225"/>
 
 <img alt="3" class="alignnone size-medium wp-image-85477 gcloudimg" data-attachment-id="85477" data-comments-opened="1" data-image-meta='{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}' data-image-title="3" data-recalc-dims="1" height="300" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_85473/3-11.jpg" width="225"/>
 <img alt="4" class="alignnone wp-image-85478 size-medium gcloudimg" data-attachment-id="85478" data-comments-opened="1" data-image-meta='{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}' data-image-title="4" data-recalc-dims="1" height="300" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_85473/4-11.jpg" width="225"/>
 
 Foldscope view of deposits on coupon


 Dr. Poonam Singh/ Srinivasa Sundara Rajan R
 
 CSIR-CECRI
 
 Karaikudi

Substances observed under foldscope

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