I think we can confirm that Rex is a natural blonde because 1) genetics are weird af and 2) that little clone kid who was also blonde. I don’t remember where I read that since Jango’s dead, Kaminoans started using their best clones to make more clones, so with that kid, imo we can have confirmed that Rex is one of the best clones and that he’s a natural blonde bc he passed that trait down to mini Rex

cienie-isengardu:

The Essential Guide to Warfare states that aberrant clones represented just 3.5 procent of each batch but since one clone batch count 32, that means 1 of 32 clones has undesirable mutation or is deficient. And that is result of cloning from original source (Jango’s DNA) – a result seen as a testament to the effectiveness of the slow-and-steady Kaminoan cloning program.

I’m no specialist of how genetics works nor what Kaminoan can and cannot do with human DNA, but blond hair is nothing unusual in Jango Fett’s family, since his mother and sister were both blond haired women in Jango Fett: Open Seasons comics:

What I think opens a gate to speculations of what genes Jango’s carried and about his ancestors. Author’s cuts from Warfare were posted on starwars.com and there was one called
Internal memo penned by Hali Ke, senior research geneticist, in which the cloner said he have now logged many sessions with our prime clone Jango Fett,

and from the text it seems Jango get not only
physical but also psychological exam

of his well-being what included also talking about his childhood to some degree, at least.

So I suspect, the moment when Kaminoans found a clone with blond hair, it wasn’t that big deal, because they expected that some of their “products” gonna be aberrant one way or another. What may explain why there is the blond clone cadet in the group – the
statistical error.

Rex could be too the statistical error, for all we know. And maybe he is (and his brothers) just telling everyone that his hair are dyed, as an excuse for his different look? Especially now, when clone troopers are allowed to dye their hair, as a sign of their individuality? Otherwise Rex would be forced to admit he is an error of otherwise perfect cloning system, what I think that may be quite an awful & personal thing to do for him.

I mean, the same guide says that

Clones who showed early initiative and leadership abilities were singled out for enhanced programming and officer training.

On
other hand, clones who proved deficient or had undesirable mutations
were reconditioned – a term that included everything from genetic
therapy to termination (After the Jedi took a more active role
overseeing clone trooper training, terminations were largely halted,
with deficient clones shunted into support roles).

Can you imagine that? Being seen as aberrant, an error from birth, then being sent for reconditioning, without
certainty

if that means just some genetic therapy or termination – and some clones never came back after Kaminoans took them – that for sure have effect on Rex. Remember “Darkness on Umbara”?

padawanlost:

I’m so
surprised by everyone reaction’s to my confession. I mean, I’m so relieved lol I
really thought I was the only one lol

anpan-chan replied to your post  “How frequently do you think Rex had to bleach his hair to keep it…”

 
It’s not that “crazy”. After all it was
established that clones can have different eye color because of slight
mutation (Trap’s being blue for example) Same might happen with hair. Of
course it doesn’t mean that all clones have different hair colors
because of those mutations. I’m pretty sure most of them really dyed
their hair to express  their individuality. Still, I like to think, Rex
is a natural blond. There is no proof saying otherwise.  
And the only time we were shown he dyed his hair it was in blue. He also
was so embarassed by it he shaved them off completely.            

             
 

The wookieepedia says Rex and the adults clones  who looked blonde
had their hair bleached. At least, that’s the case with Rex and Crys. Hotshot
(the clone kid), is described simply as blond so I think @anpan-chan might be
right. Maybe the
older clones look more like Jango but, as the Kaminoans had
to improvise, the newer batches were born more diverse. Btw, I couldn’t find
any reliable source confirming Rex’s natural hair color, so maybe I’m not that
crazy…yay!lol 

Rex [about Dogma]: He’s wound tight, but he’s loyal.

Anakin: He kind of reminds me of you.

Rex: Maybe, back in the day.

Rex we know from TCW is not the same man when war just started. I kinda like the idea of him being the “statistical error” because its add to the comradeship between Rex and Skywalker, since both are the
aberrant

of their respective groups – Jedi and Great Army of Republic. And who knows, maybe this is one of little things that made them so close to each other?

Also, if the blond hair is natural, Rex may shave them out of habit, as a way to minimalize his visible aberration from other clones.