Can anyone explain these stains???? A mystery

Joined
2 Jun 2005
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Location
West Midlands
Country
United Kingdom
Hi.............can anyone explain the appearance of these brown stains 18months after the slabs were laid. The stains appear directly above the area between the dabs of mortar and do not show on the underside of the slab.
This is a real puzzle and would appreciate any input. Thanks
 
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I don't know but the only way to stop it is solid mortar instead of blobs
 
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