Can not believe that as old as I am that I have never even heard of Chicken Scratch embroidery. I love it! So naturally, I did a google search and wow lots of info on what it is, how to do it, how to use it, etc. Just goes to show, check the forum every single day, you never know what you will learn! Thank you Neuras for sharing.
Here is the google link. I think the link to Needle and Thread by Mary Corbet has some good details on thread, gingham, needles, etc.
https://www.google.com/search?source....0.abayOb7Rulo