Just for the record, if I had noticed the colour difference while laying them I would 100% of raised the issue with customer before proceeding. Sometimes you don't notice it until its grouted, cleaned up and you stand back and look at it.
I once laid a floor all done grouted, stood back and thought WTF. There was one tile slap bang in the middle of the floor that stood out like a sore thumb, it was a different shade.
However, if a customer is supplying materials I expect them to check that everything is present and correct prior to my arrival. If I turn up and something is missing or incorrect and I can't carry out the work the customer requested on the day they requested it is going to start costing me money. It means I have to allocate another day to that job (which a customer never wants to pay for) and also has a knock on effect for my schedule.
I once laid a floor all done grouted, stood back and thought WTF. There was one tile slap bang in the middle of the floor that stood out like a sore thumb, it was a different shade.
However, if a customer is supplying materials I expect them to check that everything is present and correct prior to my arrival. If I turn up and something is missing or incorrect and I can't carry out the work the customer requested on the day they requested it is going to start costing me money. It means I have to allocate another day to that job (which a customer never wants to pay for) and also has a knock on effect for my schedule.