Kei77 said:
The other problem is that some vendors just want to sell...and it seems they spice up the color of their pics... very dishonest in my opinion. The hybridizer of Feedback has a super blue pic of it on his website. It is very annoying. I already know it is purple like an eggplant. Silly me I still will risk buying more from them 
But this time I will limit my budget and quantities better...so you see I feel it is a gambling risk.
The hybridizer of Feed Back died in 1999; please don't blame him for doctored photos of deceptive blue!
First of all, it's important to understand that color is a perception that not everyone perceives the same. And it is very qualitative depending on the type of light reflecting it to the instrument that sees it, be the eye-brain-thing of you or me, or the camera or cell phone. There is no color perception in the dark, remember. And then what our brains and digital brains do with it after that gets even weirder.
Blue
https://www.goodearthplants.co...
This claims there is no "true blue" flower. Or at least attempts to explain the complications.
I think delphiniums and gentians come pretty darn close to blue!
Irises can "do blue"
especially the bulbous types like reticulata and hollandica
ensata can be pretty good with blue
here's a little MDB with an almost blue spot
it's planted there with a gardenwhimsy dragonfly (can't really tell what it is from that angle, but it is) with blue glass eyes--and it's close--I still see blurple though.
Anyway, the lighter blues do tend to read more blue to me
and I love 'em, but still see blurple--these were taken 10 minutes apart as the sun came up over the mountain, and obviously from different angles.
Anyway,
Here is a classic (1960) and fairly understandable explanation of iris color, co-pigmentation, and the dilution effect of lighter blues seeming more blue
http://bulbnrose.x10.mx/Iris/W...
Here is a beast of a thing that is much more current (2020)--obviously some new discoveries since, but then again, it still doesn't change the fundamentals of why blue is so difficult to achieve.
https://journals.sagepub.com/d...
And here is an analysis (2019) of the actual violet blue color and co-pigmentation of Victoria Falls
https://www.kahaku.go.jp/resea...
