I would appreciate any feed back on this issue. New construction, and white grout lines are turning yellow. Why is that happening and what can be done to correct the problem?Thanks,Roger @ Restoration Stoneworks LLCVisit list archives, subscribe, unsubscribe or change your subscription preferences: http://stoneandtilepros.simplelists.com/sccpartners Start a new conversation (thread): sccpartners@stoneandtilepros.simplelists.com