Before there was Keith Jones (at Berkley), there was Paul Johnson, who was vice president and technical coordinator of research at Berkley and Co., Inc. He held degrees in chemistry and mechanical engineering and had several detailed fishing line articles in early Bassmaster magazines, along with a published book on the subject. Here he is pictured getting a line on lines and their visibility.
As you can see in the old photo from 1984, he took his research of line visibility seriously, going into the water to photograph and test lines. In this picture he’s holding two crankbaits that have different lines attached to them. On the right, is a line that is highly visible in the picture while on the left, you can’t make out the line. It’s a pretty impressive test.