I trying to do some minor repair on my cream city brick home, (tuck pointing, brick replacement) What mortar am I supposed to be using? I'm trying to match the old mortar (as best I can) last time I bricked up an old doorway that wasn't being used, the mortar looks soooooo grey. Isn't there a mortar that has a sandier color and specifically used for this type of brick. PLEASE HELP