Bruce Watt
TF
Hello Paul,
The cracks are very fine and do not photo very well for you to be able to see.
However, I feel with all you helpful tilers out there, you may like to try this for your selves. Select a large-ish tile and apply 7mm plus of quick set adhesive to the tile back, do not apply to the wall. Put to one side somewhere and over the following weeks and month watch and see what happens. If the theory is correct you should be able to reproduce the effect.
I believe for weeks and even months later the effect does grow even when you think the adhesive is dry and set.
The cracks are very fine and do not photo very well for you to be able to see.
However, I feel with all you helpful tilers out there, you may like to try this for your selves. Select a large-ish tile and apply 7mm plus of quick set adhesive to the tile back, do not apply to the wall. Put to one side somewhere and over the following weeks and month watch and see what happens. If the theory is correct you should be able to reproduce the effect.
I believe for weeks and even months later the effect does grow even when you think the adhesive is dry and set.