Can you become invisible in RuneScape?

As far as I know you can't, but there might be a quest or something where you can be a for a short period of time. There is a glitch that allows you to turn invisible. I ain't sure if it is fixed, but if you are really interested, try going to YouTube.com, search for "sachiko nami", she did a video on how to do it. BUT if you mean the ghostly robes, which makes you supposedly invisible (it is more of semi-transparent), you need to do a quest "desert treasure" and etc.