I have gone through many hundreds of sheets of Platine and I find that 
the "black speck" problem is endemic.  It is extremely frustrationg for 
me because, for those of you who know my work, of the vast areas of 
continous tone in my skies and water.  One tiny speck can ruin your whole 
day.
Anyway, before coating the Platine I look at it VERY closely under a 
bright halogen light.  I practically go cross-eyed trying to focus my 
eyes on the all-white surface of the paper -- it's like snowblindness.  I 
look over the whole paper for the slightest speck.  I then whole the 
paper up to the light and look for *imbedded* specks or dark areas.  I 
find that about 5%-10% of the paper is good (my sheets end up as 15x20 so 
there is a pretty large area that needs to be speck free.  Someone making 
smaller prints might have a better yield.  
Also, someone with a more "typical" photograph -- by that I mean an 
average amount of texture, not just huge areas of continous tone -- will 
have more luck.  If I was printing an image of a forest, for example, the 
specks could easily remain hidden.  As it is, I sometimes sort the paper 
according to where the specks are and then choose to print certain images 
on certain pieces so that areas of dark shadow or detail obscure the specks.
> refund of payment on return of the paper? Is somehting being done to
> correct this problem by Arches? Any guarantees if we buy directly from
> Martin Axon?
No, Martin's paper is just the same as anyone elses.
Good luck,
David Fokos