To be frank I had no idea about this technique until I had to think about a "jugaad" or say workaround to help my sister in getting her thumb impression for one of her exam application form.
I followed this technique and I was successful on 4-2-2021. my application was accepted. one should be very very very careful, and should have certainty in his fingerprints. It should be visible. I would say it also a bit depends on luck.
Thank you ... I have a exam tomorrow and I didn't know there is something called declaration form to be also carried along with admit card...so I this video saved my life...if I would have said abt thumb impression to my parents tomorrow morning that is on exam day itself they would have buried me underground ☠