Stephen Parkinson has already explained the two comment types so I won't repeat his
text, but I should point out that when you close the comment that 
starts with

/*#declare Rusty=pigment

then you have a second problem on the line that starts with

/*box {

In traditional C programming (which this is not) it is not possible to nest the /* */
comments.  The following is invalid and will not parse:

/* hello /* world */ */

I mention this because the box contains a Silver_Metal texture that has been commented
out.

Kinda messy right now but I'm sure you will figure it out.

Good luck.

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