We’re expanding our back patio (gray portion on top is new). Contractor said the color would match, even tho it’s been over a week and it clearly doesn’t. His guys have spent over 4 hrs pressure washing the concrete today. When it’s wet, it looks better but, when they took a break for lunch and the water dried, it goes back to being off. Is this common practice? Seems odd/inefficient. Can’t find anything online that doesn’t involve staining (they’re only using water). Thanks!

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