To be honest with you, I usually soak my nuggies for just a couple hrs or maybe overnight to remove rust and maybe some host dirt. If I want to lighten up some quarts I seem to gravitate towards the Whink but once again, I'm too impatient to soak with either muriatic or the hydroflouric (whink) for more than a few days so I'm not the one to really comment ? I do "think" the muriatic will not dissolve the quartz but the Hydroflouric will over time

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Here's a Montana nugg that I soaked for 5-6 days with both Hydro and muriatic seperatley and could not get what I thought was quartz host to lighten up...not one bit? Have no idea what the host rock is and don't really care but I did try and lighten it up with no success what so ever..... This is the only one I've soaked for any real length of time.....