marble can be cut easily with a masonry bit, just like tile. cut the holes using the bracket as a template, than insert the expandable plastic shims in the holes(like you would for drywall). then screw the brackets on.
A towel bar can be mounted to a vanity if it has a solid surface that can accommodate screws or nails. This can be done on the side of the vanity using the appropriate hardware.
The exact instructions for installation of a towel bar will vary depending on the model of towel bar (if there is one), and the makeup of the bathroom. However, such installation is generally quite simple, and involves a drill, screws, and screwdriver.
Marble Bar.
A ceramic of plastic towel bar will never corrode, a stainless steel bar will likely not corrode either.
Isopropyl rubbing alcohol on a paper towel should suffice.
a wet paper towel can hol 1 marble
Fred Astaire Danced on it
it is bounty
You can use non-expanding base to fix a block inside a hollow core door to give the towel bar extra strength. Screws can also be used on the door to give the towel bar strength.
Brass does not oxidize easily, and a brass towel bar if properly plated will not either.
48 inches off the floor
The proper towel bar arrangement should have one bar near the sink, and one bar near the tub or shower. The towel bars should be arranged so that towels are not getting wet while running the water in the sink or bathing. A lower height bar should be used for small children.