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Hi, I'm new here so apologies if this has already been addressed. 

Is there a way to erase the edges in a repeat pattern to create a seamless pattern? The below link shows an example of what I mean - it's the white edges that I want erased.

https://topdrawer.aamt.edu.au/var/aamt/s...2_fig2.jpg

Thanks for any help! 

You can take one tile as reference or select each tile and shift it until the white slit has gone.
Example with one tile :
[attachment=6668]

@Huda

That is a poor image as a base to work on. Is that the only one available ?

The section marked produces a poor tile. "it's the white edges that I want erased" crop (or copy) to size and use the clone (or heal) tool to clone out the white patches.

For a better result, just using Gimp tools, then one way is use a quarter of a tile, then duplicate - flip - move. Once vertically and again horizontally.

All that in 3 minutes, https://youtu.be/KdpZAB9hod0