Hi Dee, I would use proper tile adhesive over pva.The prolem with transparent tiles/glass is that the ribs you trowel into the adhesive show through.To avoid this you have to use a trowel with tiny ribs or a solid bed of adhesive of same thickness.
Are you tiling direct to an exterior wall?
Use a good quality waterproof adhesive and grout,dying grout is easy enough,never tried or heard of dying adhesive.
Good luck,don't forget pictures:)
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