The saddle is basically a long, skinny nut, usually made of bone or a synthetic material, that is inlayed at the bridge. To lower the action on an acoustic guitar you don't have to adjust the bridge in any way, you only have to adjust the saddle.  The saddle serves the same purpose as the nut, controlling the height of the guitar strings. If you lowered the action at the nut, you must also lower the action at the bridge or your tone will be off. The strings are strung through the bridge, and their tension holds the saddle in place. It isn't glued in place. Saddles may be either straight or compensated. A compensated saddle is curved to compensate for the tone of the strings and help keep the guitar in tune. This is why if you want to lower the action at the bridge, you always sand down the bottom of the saddle, never the top. Use a ruler to measure the distance between the sixth string and the 12th fret. You'll also want to measure the first string at the 12th fret. You don't need to measure the other strings. Most acoustic guitars take 2/32 of an inch (about 1.5 millimeters) of action for the first string and 3/32 of an inch (about 2.3 millimeters) of action for the sixth string. If your action is more than that, you'll want to lower it. Since the tension from the strings holds the saddle in place, you won't be able to take it out without first loosening the strings of your guitar. However, you should be able to leave them on the tuners. Use your string winder to detune your guitar until the strings are loose and floppy. Don't take your strings off the tuner. You'll have to take your strings off if you want to get the saddle out, but there's no reason to remove all of your strings. This will just give you extra work and make the process take longer.  The lower three strings should give you enough room to slide the saddle out, provided the other three strings are really loose and floppy. You still don't need to remove your strings from the tuners unless the strings go through the bridge. If you do have a string-thru bridge, this process will take a little longer because you'll have to remove the strings from the tuners as well to get the saddle out. Once you've removed the lowest three strings, you should have enough room to slide the saddle out of its slot on the bridge. Do this very carefully. If it's wedged in there tightly, you may need a pair of pliers to grip it and pull it out safely without damaging your guitar. Once the saddle is out of the bridge, you're ready to lower your action at the bridge. Take care to keep it even as you sand it, because an uneven saddle will ruin the tone of your guitar.  One way to do this is to place a piece of double-stick sand paper on a level table or work bench. Get the ruler you used before and determine how much you want to sand down your saddle. Mark your saddle across with a pencil. Then all you have to do is sand until you get to the pencil line. Keep in mind that if you sand your saddle down too low, your strings will be too long. You also don't want to take more than you need. Be cautious and only sand down a little at a time. You can always repeat the process if you didn't sand enough, but if you sand too much you won't be able to put it back. Lift your strings and carefully slide the sanded saddle back into its slot. Then replace the bottom three strings that you removed and retune your guitar.  Measure the action again and play your guitar a little bit to see if you like it. You may want to repeat the process and sand down a little more. Keep in mind that industry standards are just that, but each guitarist has their own personal preference for how much action they like.
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One-sentence summary -- Identify your bridge and saddle. Measure your guitar's action at the bridge. Loosen your strings. Remove the lower three strings. Remove the saddle from the bridge. Sand down your saddle. Replace the saddle and bridge.

Article: Plates of the size used as covers for microscope slides would be ideal. Once the plates are cleaned, handle them only by the edges. Do this by touching the surfaces with the leads from a multimeter. Once you have established which side of each plate is the conductive side, place them side by side, one plate conductive side up and the other conductive side down. This will hold the plates in place for the next step.  Place the tape along either of the long side of the plates to overlap 1 millimeter (1/25 inch) of the edges. Place tape over the outer 4 to 5 millimeters (1/5 inch) of the conductive side up plate. Put 2 drops on the conductive side up plate, then spread it evenly over the plate surface. Allow the titanium dioxide to cover the conductive-side-down plate. Before applying the titanium dioxide solution, you may first want to coat the plates with tin oxide. Now you'll treat the 2 plates differently.  Place the conductive-side-up plate on an electric hot plate overnight to bake the titanium dioxide onto the plate. Clean the titanium dioxide off the conductive-side-down plate and place it where it won't collect dirt. The dye can be made from raspberry, blackberry or pomegranate juice or by brewing a tea from red hibiscus petals.  Do this while the titanium dioxide-coated plate is soaking. Mark the side that doesn't conduct with a plus sign (+). You can do this by going over the conductive side with a pencil or by applying a graphite lubricant. Cover the entire surface. Rinse it twice, first with de-ionized water and then with alcohol. Blot dry after rinsing with a clean tissue.
Question: What is a summary of what this article is about?
Obtain 2 equal-sized glass plates. Clean both surfaces of the plates with alcohol. Test the plate faces for conductivity. Apply transparent tape to the plates. Apply a solution of titanium dioxide to the plates. Remove the tape and separate the plates. Prepare a shallow dish filled with dye. Soak the titanium-dioxide-coated plate, coated side down, in the dye for 10 minutes. Clean the other plate with alcohol. Retest the cleaned plate to find its conductive side. Apply a thin carbon coating to the conductive side of the cleaned plate. Take the titanium-dioxide-coated plate out of the dye.