Question: I couldn't seem to find this existing question, although it may be somewhere boiled into a two-hand tapping question somewhere else. 

I come from electric bass and the Victor Wooten style of two-hand tapping. In his method, he uses a hair scrunchie to mute the strings on the other side of the tap. To explain what I mean, fret a string at the twelfth fret and then pluck either side of the string. Then note that both tones ring out when you tap that fret percussively. 

I used a similar method on bass, but the problem was this also mutes open strings. I've noted that Antoine DuFour uses a handkerchief which is tied under the strings immediately behind the nut, which he has claimed helps with this, but I've got a suspicion there is another technique or process that you need to perform to mute the strings on the other side of where you are stopping them with either hand.

I have this problem the most on the acoustic guitar, as with electric instruments the pickup is only really working towards magnifying whatever frequency is happening on that side of your hand. On the acoustic, the other pitch very clearly rings out, and I haven't found a way to mute that or get rid of it. 

Is there perhaps a type of string material, or some kind of action setting to help with this? Are there videos where people talk about this? I can't seem to find any.

Thanks for any input.

Answer: 
Depending on the type of tapping I use three mechanisms - 

* For your Joe Satriani style tapping where you are using no open strings, I pop a handkerchief in at my first or second fret or thereabouts. This kills pretty much everything from that end of the string.
* On an electric guitar I also use a noise gate just to increase the level needed to be audible.
* If I am tapping but may also sound from open strings I use the side of my left hand quite extensively, and for certain passages I bring my right hand over to the nut side of my left hand to damp a specific string as I tap with my left hand.
I was introduced to using a hair band by one of Andy James videos at licklibrary.com. Simply pull over nut of the guitar onto the first fret. Once installed it's easy to add and remove just by sliding it from the top of the neck onto the first fret. It's softly dampens / mutes the open strings but if you intentionally want to play an open note it will still sound.