This instructional video demonstrates the proper technique for 'undoing' or TINKing your purl stitches so that you don't lose them and so that they sit properly on your left hand needle once you take them out.
by Paracord 101
by NR Art & Drawing
by Crazy art & crafts
by Cartooning 4 Kids
by How2DrawWell
by Cyrus Kiddie Toys
by Elena Madsen