[nabs-l] Braille Highlighters?

[Brandon Keith Biggs]

Hello,
I am wondering if any kind of Braille highlighter has been invented yet? 
Something that could change the texture of the page while still keeping the 
Braille readable?
This has been something that all my teachers have been telling me to do with 
my Braille books and music, as of now it is either write notes in another 
device that may crash, or put not really accurate dots that can fall off on 
the spot I want to mark. (Not to menschen that becomes a lot of dots after a 
while).
So if anyone has ever encountered a Braille highlighter please let me know!
Thank you,

Brandon Keith Biggs