change tie color

[Gianmaria Lari]

This code 

\version "2.19.65"

\fixed c'' {

  \override Tie.color = #grey

  c1 ~

  \revert Tie.color

  \override NoteHead.color = #grey  

  c1

  \revert NoteHead.color

}

change the color of the tie and the second c1 note (see attached image). 

I would like to simplify the previous code and write something like:

\version "2.19.65"

\fixed c'' {

  c1 \grey {~ c1}

}

Here http://lsr.di.unimi.it/LSR/Item?id=985 there is something similar but I have not been able to modify it according my needs. 

How can I do it?

Thank you, g

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