Lamy Copper Orange is a colour that makes me think of the skin of a persimmon. As oranges go it is quite unremarkable. Most oranges of note have interesting shading characteristics and some, like Noodler's Apache Sunset, are truly phenomenal. The Lamy ink seems a little mundane next to its peers. The one place where I have seen this ink shine is in this piece by Calligraphy Nut where the ink's uniformity is a bonus rather than a hindrance.
Shading: There is shade variation in the writing but I wouldn't consider it to have any significant shading properties, especially compared to other orange offerings.
Bleed Through: Some bleed through on Copy paper is experienced in wider nib sizes.
Show Through: Show through is not as much of an issue as the bleed through. If you are OK with the amount of spot bleeding, you'll likely be content with the show through too.
Saturation: Average saturation.
Water Resistance: None.
Drying Time: Quite respectable, 20-25 seconds using an EF nib on Rhodia.
Flow: I found the flow and lubrication to be slightly less than average.
Colour Make Up
This ink trace is lead by a narrow band of yellow that quickly transitions through orange and into a subtle peachy pink.
I'm not crazy about this ink. It's fine but there are so many oranges out there that bring more to the table. Given the choice I would pick Noodler's Habanero or V-mail Operation Overlord Orange before purchasing the Lamy ink. This is a special edition ink and it seems that full bottles are hard to come by now but cartridges are still available.
For other reviews of this ink search Ian Hedley's Pennaquod search engine.