While reading this article, I began to wonder:
What is it about the yellow Parker Duofold that made it so incredibly fragile? Everything I've read about this pen tells me that it was prone to cracks and splitting, and yet, as far as I know, it was made exactly the same as all other permanite Duofolds. What is it about this one, particular pen, that makes it a magnet for damage?
Full Version: Snap, crackle, pop!
From my finding dealing with fibreglass. There are some colour that are pro to such. I can't explained but this do happen.
Secondly if you are a watch player, Blue dail (face) also have this problem. They tends to crack Or fade......I can't explained but this do happen.
Another classic example is that black colour chances of such problem are less........(You seldom see black barrel or shell pen have this problems...
While dealing with some Security Colour, We will told of "Colour Fast" under UV some colour happen too fast ..... I am sorry I still do not know how to tell you
Secondly if you are a watch player, Blue dail (face) also have this problem. They tends to crack Or fade......I can't explained but this do happen.
Another classic example is that black colour chances of such problem are less........(You seldom see black barrel or shell pen have this problems...
While dealing with some Security Colour, We will told of "Colour Fast" under UV some colour happen too fast ..... I am sorry I still do not know how to tell you
QUOTE(Shangas @ Apr 11 2008, 12:35 PM) [snapback]574323[/snapback]
While reading this article, I began to wonder:
What is it about the yellow Parker Duofold that made it so incredibly fragile? Everything I've read about this pen tells me that it was prone to cracks and splitting, and yet, as far as I know, it was made exactly the same as all other permanite Duofolds. What is it about this one, particular pen, that makes it a magnet for damage?
What is it about the yellow Parker Duofold that made it so incredibly fragile? Everything I've read about this pen tells me that it was prone to cracks and splitting, and yet, as far as I know, it was made exactly the same as all other permanite Duofolds. What is it about this one, particular pen, that makes it a magnet for damage?
It's common for plastics with high dye content to be brittle - because the dye interferes with the structure of the plastic, which is otherwise very resiliant.
Perhaps to get such a vivid lasting colour, Parker used more dye than normal in the mix?
Perhaps to get such a vivid lasting colour, Parker used more dye than normal in the mix?
Aside from the fragility of the plastic - one can see the cracks far more redily on the yellow because of the contrast with the ink or dirt that gets into the cracks. Tiny hairlines on a black pen will not be found. And we tend to go out of our way to look for the yellow defects and cracks in RHR too.
QUOTE(vermiculus @ Apr 12 2008, 03:30 AM) [snapback]574575[/snapback]
It's common for plastics with high dye content to be brittle - because the dye interferes with the structure of the plastic, which is otherwise very resiliant.
Perhaps to get such a vivid lasting colour, Parker used more dye than normal in the mix?
Perhaps to get such a vivid lasting colour, Parker used more dye than normal in the mix?
Ah. That sounds like the most likely reason. Thanks
Very likely the pigments used interfere with the chemistry of the celluloid, resulting in a more brittle material. On red hard rubber, the lack of carbon black changes the chemistry, again resulting in a more brittle material. Rubber isn't black just for fun, it's black because the carbon black absorbs UV, preventing UV damage to the rubber, and it appears that the carbon black is linked in the rubber polymer, too.
Lack of UV protection is probably the most significant cause of embrittlement though.
Peter
Lack of UV protection is probably the most significant cause of embrittlement though.
Peter
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