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Blue does not ever breed true, Andalusion blue that is. Blue x Blue will ALWAYs result in 25% splash, 50% blue and 25% black.
For your earlier question, if you are wondering what to breed to black to get blue, you will need splash. Splash x Black = 100% blue.
If you breed a solid splash (not spangled) to your spangled black, you will hatch all solid blue chicks, but some of them will be split for mottled/spangled. I have not worked with spangled, but have worked with mottled, assuming the pattern variety works the same.....
Breed the blues back together (no sure way to tell which are carrying the spangled gene though, also referred to as "split") and if you do multiple pairs, you should eventually pair two that are split for the mottled gene and have some chicks hatch blue/spangled, but you will also have splash & black chicks from these breedings. And again, not all will hatch spangled, you will and have splits (carrying the gene, but not showing it), some solid (no spangled gene being carried).
Once you get two blue spangled parents, all the off spring will be spangled, but you will hatch BBS Spangled.
To get only Blue Spangled chicks to hatch, put a splash spangled with a black spangled. All offspring will be blue spangled.
Self-Blue, also called lavender in some breeds, does breed true, hence the name "Self"-Blue. This blue is a lighter color with no lacing, I would consider it more smoky in color. Don't know of any other color called smoky, so wondering if they are referring to this in your quote? Old English Self Blue and Self Blue Belgian Bearded D'uccle's or Booted Bantams (same as d'uccle but no muffs and beards) .........are the only breeds I can think of that have been in the standard for a very long time. But lots of new breeds now have this variety as a new project color, including Ameraucana (both bantam and LF), bantam cochins (not sure if anyone has these in LF yet), Japanese, Orpingtons, Australorps, Araucana....these are all breeds I have heard of folks working this color, in solid form.The Coronation Sussex is a Columbian x Self Blue, so that is another project using the self blue gene....or the Porcelain d'Uccle's are mille fleur (spangled) x self blue....
HTH!!!
Thank you.