Should presumably read:
The artist printmaker, who should be keen on exploiting the sensitivity of pigments, should have some knowledge of sizing techniques.

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Note added at 24 mins (2005-10-25 14:13:10 GMT)
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But see also my response to Elizabeth.

In fact, the English isn't brilliant, at all!

I think it is meant to meant:

"Artist printmakers who are keen to make the most of pigments need to have some knowledge of sizing."

I've deliberately paraphrased in order to make my interpretation clearer.

'keen of' simply isn't English!

And the sentence shows lots of common te,nde,cies that I find also in my own pair (FR > EN) --- like the use of 'the + singular' where in English a plural without article often reads better (though in this particular instance, that would only be a question of personal preference/ style...)

But the key issue is, should the WHOLE of the "who...pigments" clause be treated as a subordinate clause (in which case it needs a comma at both ends as Jack suggests), or should be treated as qualifying 'artist printmakers' (as I read it), in which case it must not have either comma.

My reading is that the knowledge of sizing is important to any artist printmakers who may have a special interest in colour; I don't think this is necessarily at all the same as Jack's reading, which would suggest that artist printmakers, by definition are concerned about colour, and so need to know about sizing.

But I am quite sure that there are some artist printmakers who are NOT "keen on exploiting pigments"...

It's like the difference between:

"Little boys who climb trees must expect to get hurt" --- my interpretation, implies that not ALL little boys necessarily climb trees...

and:

"Little boys, who are naturally more boisterous than little girls, must be expected to make more noise" --- which implies that all little boys are by nature more boisterous (this is my understanding of Jack's interpretation)

"The artist printmaker, who **wishes/wants to exploit** the sensitivity of pigments, etc.

This wording is more universal ("keen on" is very British) and stronger, in my opinion. This is just a suggestion. Then translating it to Italian should be simpler, using this wording.

I agree with Jack on the rest, regarding punctuation. : )) HTH

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Note added at 30 mins (2005-10-25 14:19:31 GMT)
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This is not for points - I just think it is easier to translate want or wish than keen on, to Italian, but that is up to you!

The artist printmaker who is keen on exploiting the sensitivity of pigments should have some knowledge of sizing techniques.

(no commas)

i.e. as an artist printmaker (or artist/printmaker) you need to know about sizing techniques if you want to exploit the sensitivity of pigments


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Note added at 4 hrs 13 mins (2005-10-25 18:01:42 GMT)
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In view of Can's point about strength, below is what I was going to put at first and which is a little "stronger":

The artist printmaker who is keen to exploit the sensitivity of pigments should have some knowledge of sizing techniques.


i.e. Any artist printmaker who wants to find out about using pigments should already have some knowledge of sizing.

Perhaps "subtleties" would be better than "sensitivity", and "explore" rather than "exploit"...?