Garden Patio Advice

Chyna81

I have just had my patio laid and pointed with Kiln Dried Sand, it looked beautiful until the weather took a turn for the worst and came the rain then I noticed that the slabs dried quickly in the middle but around the edges have a darker stain as if the slabs are wet around the edge, I have seen images on the internet and I believe I have picture framing which is on every slab but it does not give any advice on how to rectify this problem.

I was going to seal the slabs but again, I’ve read if I was to seal the stains this would just be sealed into the slabs.

Any advice would be appreciate on how I can remove the picture framing or how to remove the kiln dried sand?

Thanks in advance.