deep blue

(v.s. ), "doubtless meant to describe the blue smoke of a sulphurous flame" (Swete): (Hom., Eur., al.).† of hyacinth, hyacinthine ὑάκινθος Re 9:17

hemelsblauwe

dark purple or blue, of the color of hyacinth.

dark blue

"hyacinthine" or "jacinthine", i.e. deep blue

jacinth

ὑακίνθινος, -η, -ον (ὑάκινθος), [in LXX for תַּחַשׁ, תְּכֵלֶת ;] of hyacinth, hyacinthine (see: ὑάκινθος), "doubtless meant to describe the blue smoke of a sulphurous flame" (Swete): Rev.9:17 (Hom., Eur., al.).† (AS)