How to remove ores outline:

Simply drag the folders into their file paths where they usually belong to.

Vanilla blocks:
make sure you're in filepath: Glowing Ores!/assets/WithoutBorders/
there copy the folder "textures" & "optifine"
go back to Glowing Ores!/assets/minecraft/ and paste the folders here, just click on "replace files" if something prompts you.

For modded such as Create & Mekahisnm, etc.

go back to Glowing Ores!/assets/WithoutBorders/modsupport
and copy the mod you wish to change the borders on.
then go back to Glowing Ores!/assets/ and paste those without borders inside there. (just replace the files)

if you wish to return it back to normal again, make sure you do the same thing with "WithBorders(Default)". Same steps as usual.
