Thanx WPyogi for your quick and helpful response. This exercise has been valuable for me.
I was unaware of Firebug and have since loaded it in Chrome and will use it in future. I can see now where the code is being pulled from and have satisfied myself that, indeed as you say, the color is held in SQL’s “wp-options” table.
I have taken on board your recommendations about Child themes also.
I need to learn a lot more obviously but this has satisfied my curiosity and dealt with my trainer wheel frustrations!
I can only assume the “table driven” versus “style sheet driven” color parameter change must have been part of a version enhancement since this book was published in 2010. I can’t imagine this author (Sabin-Wilson) would have made such an obvious faux-pas otherwise. But what would I know??
Thanx once again & best regards.