Interesting thing I noticed this past weekend when my husband and I were out buying some plumbing equipment.  We were at Lowe’s, which is better than Hoe Depot.  We needed shut off valves.  All they had were blue valves there.  Then I remembered, a month or so ago, when were were doing some work on the outside faucet, we were at Hoe Depot, and all they had were Red valves.  So, we bough one at Lowes in Blue and one at Hoe Depot in Red for Cold and Hot.  Insane