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Old 08-25-2019, 09:56 AM   #1 (permalink)
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Default Herpa Premium Yellowing..Another Theory

OK, I dont want to rehash the dozens and dozens of topics and threads on Herpa Premium yellowing. Its a topic worn out...Yes, it is worse on some and non existent on others. Good case is the Emirates A300 which is probably the worse of any.

Next is the LH 747 and as we know, again, dozens of theories and discussions on why they turn yellow and how to correct it.

Last night I was looking at my Premium LH 744 and was disappointed on how it appeared to be turning yellow and for the second time in months I was going to pack it up and sell it to a collector here on this forum at a reduced price. But as I carried it off to be packed and went into a different room, the model suddenly turned almost all white. Not perfect, but 90% of the yellowing went away. I'm not saying they don't turn yellow, as some do, but there is an obvious fuselage change of color just based on the effect of overhead lighting and the color those bulbs are giving off. In this case the fluorescent white overhead lighting corrected what was a yellowing 747 to almost white.

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Old 08-25-2019, 10:16 AM   #2 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

Russ, you and Homer must of made a wrong turn when in LA for the show and got into some Sheba or better yet, ditch weed! Did you also have the munchies during this Willy Wonka boat ride!

Lighting can impact how things look, including colors on the walls, fabric, ladies in da club () etc. So why not airplane models as well! One of my display cabinets has both florescent and halogen lights, neither of which I use regularly because I don't like the look the planes have while the lights are on. Both give a different look!
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Old 08-25-2019, 12:43 PM   #3 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

I had no idea about the diecast yellowing issue until I received a Gemini Pam Am billboard 727-200. It’s not just the plasteeecs.
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Old 08-25-2019, 02:10 PM   #4 (permalink)
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Ultraviolet light and plastic is bad.

Aging and plastic is bad.

Plastic itself is bad.

End of story.
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Old 08-25-2019, 03:56 PM   #5 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

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Russ, you and Homer must of made a wrong turn when in LA for the show and got into some Sheba or better yet, ditch weed! Did you also have the munchies during this Willy Wonka boat ride!
menu consisted of Persian, In and Out and Proud Bird so you may be right!
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Old 08-26-2019, 06:31 AM   #6 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

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Plastic itself is bad.

End of story.
When I look at all the zinc-rot and bare metal oxidation-threads, it appears to me neither material is aging favourably.
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Old 08-26-2019, 01:14 PM   #7 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

Agreed Franz. The tarnishing on polished models can be horrible.. Both materials have their downsides allthough I prefer metal too.
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Old 08-28-2019, 08:03 AM   #8 (permalink)
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Love Persian food! In & Out, and Proud Bird...definitely explains your theory Russ! Did you see Epstein's gal at In & Out? You guys missed one stop...Burbank's House of Hobbies to visit Glen and go get Cuban food at Mombo's!

Friend of mine knew one of his pilot's...oh the stories I heard!
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Old 06-27-2020, 06:42 PM   #9 (permalink)
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This is certainly interesting, sorry to bring up an old thread, but I have noticed on a couple of my diecast models when they are placed in a room where they get more light over time it appears that the yellowing lessons…
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Old 06-27-2020, 09:42 PM   #10 (permalink)
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And let me guess...

They all are “polished” !!!

I mentioned this here in a thread “Heaven or Hell” (if I remember it right) several years ago.

Because of this I stay away from these kind of models so good as I can...
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Old 06-27-2020, 09:44 PM   #11 (permalink)
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PS: And of course sunlight is in general a killer of ALL models...
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Old 06-28-2020, 03:10 PM   #12 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

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PS: And of course sunlight is in general a killer of ALL models...
Correct me if I'm wrong, but I thought I read somewhere on the forums of people taking yellowed plastic Herpas and letting the sunlight whiten them up.

My Herpa Premium KLM B744 bought back in 2001, looks as good as it did on opening the box. Doesn't really get any natural light.
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Old 06-28-2020, 03:26 PM   #13 (permalink)
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Correct me if I'm wrong, but I thought I read somewhere on the forums of people taking yellowed plastic Herpas and letting the sunlight whiten them up.

My Herpa Premium KLM B744 bought back in 2001, looks as good as it did on opening the box. Doesn't really get any natural light.
I have heard this as well........
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Old 06-28-2020, 03:45 PM   #14 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

Hi,

white yellowed plastic can only be whiten by using hydrogen peroxide to avoid a complete new painting but you should "heal" the model when it is starting to get yellowed as yellowing of 10 years under spotlights or sunlight you will not get back to the original white by 100% - only 70-80%.
But as this is a very sensitive chemical compound you have to use it with care (gloves, protection glasses, etc.) and the concentration you can purchase is very restricted.

The bigger problem is if a model is yellowing only at one side - because of position of a model in a display or the spot above or a window aside - as then the discrepancy is seen more clearly.

Regards, Wolfgang
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Old 06-28-2020, 06:58 PM   #15 (permalink)
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When I look at all the zinc-rot and bare metal oxidation-threads, it appears to me neither material is aging favourably.
I've seen quite a few of my Herpa/ Hogan models yellow (granted it's the early production models) I've never seen any zinc rot on my metal models.
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Old 06-29-2020, 02:10 PM   #16 (permalink)
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Hi,

white yellowed plastic can only be whiten by using hydrogen peroxide to avoid a complete new painting but you should "heal" the model when it is starting to get yellowed as yellowing of 10 years under spotlights or sunlight you will not get back to the original white by 100% - only 70-80%.
But as this is a very sensitive chemical compound you have to use it with care (gloves, protection glasses, etc.) and the concentration you can purchase is very restricted.

The bigger problem is if a model is yellowing only at one side - because of position of a model in a display or the spot above or a window aside - as then the discrepancy is seen more clearly.

Regards, Wolfgang
This is completely correct. I just recently did the Emirates A300. There is still some residual yellowing and did not completely whiten but it did come back maybe 90%. I know there is some debate what causes the yellowing. In my instance, the most yellowing seems to coincide with the lower foam liner and where it held the model along the fuselage.

Anyway, there are lots of videos on the subject of ‘retrobrite-ing’. Where I live you can’t buy hydrogen peroxide in concentrations above 40%. I bought the cream one that made it easy to apply. You need to leave it in the high noon sun and the high temperature helps the speed.

Be warned that with any metal parts, or metal detailing (some models had a metal foil applied) the peroxide will react with them, but amazingly the tampo printing is unaffected.
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Old 06-29-2020, 02:52 PM   #17 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

Hi,

with plastic the molecules will be destroyed by UV-light and of course material mixture and proportion of UV is important for yellowing more/quicker or less/slower.

You can see this also on keyboards, light switches, etc. and I do not mean the smoke of cigarettes etc. which would also yellow plastic parts but this yellowing is mainly on the surface and this you could wash off.

As on a diecast box the used chemical components are not indicated - maybe we will see this in some years - it is also difficult to find out how different chemicals will react as same/normally used preservative varnish/paint e. g. used after adding or changing decals will not work properly with all the different models of different manufacturers as all have their own chemical recipe and they were/are changing this over the years.

Regards, Wolfgang
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Old 07-01-2020, 12:25 AM   #18 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

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Originally Posted by DC-10_Tony View Post
Ultraviolet light and plastic is bad.

Aging and plastic is bad.

Plastic itself is bad.

End of story.
You read my mind man all in all plastic yellows no matter what coin you throw at it, best to take that fact as is and stick to diecast, yes it costs more but you will be better off.

Then there won't be any need of these repetitive topics that go on about this same thing over and over again.

And hey, ya know the fact, right?
Well then there is no need to know anything else.

That's pretty much it really.
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Old 07-01-2020, 04:09 AM   #19 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

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You read my mind man all in all plastic yellows no matter what coin you throw at it, best to take that fact as is and stick to diecast, yes it costs more but you will be better off.

Then there won't be any need of these repetitive topics that go on about this same thing over and over again.

And hey, ya know the fact, right?
Well then there is no need to know anything else.

That's pretty much it really.

and then the white paint yellows.....
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Old 07-01-2020, 04:44 PM   #20 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

The yellowing on plastic models is getting worse... today I received this one new in the box and it was allready yellowed

Herpa Premium Yellowing..Another Theory-20200701_223911.jpg

Herpa Premium Yellowing..Another Theory-20200701_223950.jpg
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Old 07-03-2020, 08:22 PM   #21 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theroy

Well after some digging through the site's history archives I found this thread:
https://www.diecastaircraftforum.com...-premiums.html


That to which lead me to this thread which has a far more detailed explanation on how to get it done right
https://www.diecastaircraftforum.com...cs-models.html

Hope this helps some of you out there with Herpa Premiums

Rock on
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Last edited by Gold Leader; 07-03-2020 at 08:31 PM.
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Old 07-03-2020, 09:46 PM   #22 (permalink)
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Default Re: Herpa Premium Yellowing..Another Theory

I posted this thread late in 2019 years after all the theories and threads as to why Herpa Premium models yellowed. The point of this thread was not to dispute or start the whole controversy all over again but only to point out that it was never mentioned that overhead lighting can make what is an apparent perfectly fine white model look yellowish depending on the aura or tint of the bulb..that's all
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