"Entre de mer" "between two seas" was originally " between two tides, the Garonne and the Dordogne rivers in Bordeaux. Mostly Merlot and some Cabernet Franc.
"Bordeaux mix" I get it now. Copper sulphate and lime, mixed with water and sprayed to inhibit fungus on vines. Being here in Bordeaux right now I can see how it's necessary - this summer is humid at times.
Note the rose to the left of the vine row. The canary in the coalmine. When the rose starts getting black spot it's time to start thinking about breaking out the fungicide.