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Post by 9822131064 on Sept 13, 2017 8:56:15 GMT
Bought by my father in the 1980's Dear Nomad An observation made with the few specimens I have of my father's collection : A Common Jezebel with yellow colour 40 years ago is now white. A Red Helen from Singapore again and here the red colour has turned to a light brown to cream. I have read comments on this thread which say yellow turning to brown referring to the Troides Helena Ab Rutilans - now is this colour change possible ?
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Post by Adam Cotton on Sept 13, 2017 9:21:32 GMT
I have read comments on this thread which say yellow turning to brown referring to the Troides Helena Ab Rutilans - now is this colour change possible ? Absolutely. I didn't want to disappoint, but those specimens look precisely the way they would after 40 years of exposure to light. I am sure they were normal yellow when they were first put into the frame, but exposure to light turns Troides yellow to brown. I should also point out that the Trogonoptera brookiana won't have been caught in Singapore. Almost certainly all the specimens were collected in the Cameron Highlands, which was the main collecting place for framed material back in the 1970s. We have framed butterflies for sale here in Chiang Mai too, and once I asked the seller where the P. ulysses and P. blumei for sale came from to see what they would say, and they insisted that they were caught on Doi Suthep, the mountain next to Chiang Mai town. When I told her where they actually came from she claimed I was wrong and continued to insist they were caught here. Adam.
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Post by nomad on Sept 13, 2017 12:47:02 GMT
I must admit, I was thinking on the same lines and Adam is quite correct about the framed Troides.
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Post by 9822131064 on Sept 13, 2017 14:10:34 GMT
OK guys a final question then how come all the troides collected say 40 years ago have not changed to this colour ?
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Post by 9822131064 on Sept 13, 2017 14:13:44 GMT
And do people have specimens of the brown variety as you say it is a common colour change then it should be appearing everywhere on the internet.
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Post by nomad on Sept 13, 2017 14:30:45 GMT
OK guys a final question then how come all the troides collected say 40 years ago have not changed to this colour ? Ask as many questions as you like on this forum. Because most Troides specimens in collections are kept in the dark in store boxes or cabinets and are not exposed to light.
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Post by nomad on Sept 13, 2017 14:39:57 GMT
And do people have specimens of the brown variety as you say it is a common colour change then it should be appearing everywhere on the internet. Even for ebay sellers that would be a bridge too far. Troides might take some time to go from yellow to brown by light and they are not pretty. They prefer to make blue Ornithoptera that are pretty and easy to obtain with UV light and have been authenticated by authors of big birdwing books. When everybody really knows except perhaps in very few cases, they are expensive frauds but pretty hence their appeal by collectors of birdwings.
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Post by 9822131064 on Sept 13, 2017 15:21:14 GMT
Very good, can you post images of your specimens here? Accept what you are saying about the specimens not being inside a drawer protected from light so now the specimens are put inside a drawer and would they turn back to yellow again I wonder.
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Post by nomad on Sept 13, 2017 16:27:00 GMT
I am afraid, the damage caused by light, I believe cannot be undone.
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Post by 9822131064 on Sept 18, 2017 12:26:30 GMT
I am afraid, the damage caused by light, I believe cannot be undone. Dear Nomad Uploading a couple of specimens of the species - Milionia Celebensis - Day flying Moths from Sulawesi-Indonesia but I cannot find an identical colour match for these specimens on the internet. Can you comment please.
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Post by 9822131064 on Sept 18, 2017 12:28:22 GMT
I am afraid, the damage caused by light, I believe cannot be undone. Dear Nomad Uploading a couple of specimens of the species - Milionia Celebensis - Day flying Moths from Sulawesi-Indonesia but I cannot find an identical colour match for these specimens on the internet. Can you comment please. Attachments:
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Post by Adam Cotton on Sept 18, 2017 12:51:34 GMT
They both look more like South American Heliconius to me, but it's hard to tell for certain and I am not very familiar with those (not my group). I am sure someone else here will have a more accurate answer than mine.
Adam.
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Post by Paul K on Sept 18, 2017 13:21:23 GMT
As Adam said earlier they are both Heliconius sp. from South America on those two photos, but to ID them you would post very good close up pictures and exact collecting location as many of them look a like.
Paul
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Post by deliasfanatic on Sept 18, 2017 13:21:35 GMT
Yes, definitely Heliconius; #1 is H. melpomene and #2 looks like H. burneyi. Both specimens are probably from NE Brasil.
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Post by 9822131064 on Sept 18, 2017 15:10:40 GMT
Thanks a ton guys for taking me from Indonesia to Brazil
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