I was describing my usual finish of wax over BLO to another woodworker and he asked me how I prevent  getting white discoloration on my table surfaces from liquids and heat. I didn’t know how to respond to his question as I had not experienced this, nor have I had any clients complain about this effect occuring on pieces out in the field. What the heck is this guy talking about, what causes these white blemishes, and why am I not experiencing them on my pieces (as this guy expects me to be)?