Help with Parker Duofold blind cap please

[velox brunneis vulpes]

Hello FPNers,

 

I recently bought an ebonite flattop Duofold Senior (see attached photo).

The blind cap is a bit darker than the rest of the pen, indicating that it probably isn't the one that originally came with the pen. 

 

Is it possible that the blind cap is made of Permanite rather than ebonite?

How can I tell the difference?

If it is made of ebonite, what's the best way to make it fade so that it matches the rest of the pen?

 

I look forward to your feedback.

Thanks.

 

Best,

John