David -my apologies for the late reply.........are you sitting comfortably...............there was this German you see......
No, only joking. At some point in the thread of my first post about February this year - we were discussing various methods of cleaning glass affected by water staining. Proprietary products have a limited effect on mild forms of calcium deposits - and suggestions were made where people had tried non standard chemicals such as coke,Sterodent etc. but again these seem un-successful when the glass itself is corroded, for say a micron or two. However, someone suggested Brasso, which is a British product made specifically as a metal polish - usually for brass, which has been around apparently for a little more than a century. Contains, among other things, ammonia and silica powder - and it is possibly this last item that helps to actually remove a micron or two of glass. The idea is that you attach a fexible drive to the end of your power drill, and into the chuck of the flexible drive you put a sewn cotton polishing wheel (say about 1/2" thick x 2"/3" diameter). Of course this only works if the piece of glass is such that you can get the wheel inside without causing damage, so has a limited use. The power drill is clamped into a vice - some liquid Brasso is put into the piece of glass - power on - and the flex. drive is held so that the wheel burnishes the areas of damaged glass, with Brasso remaining WET on the wheel. This is not a quick guaranteed method, but with a lot of patience can certainly improve the surface of the glass, where other efforts have failed. I'm sure that similar products to Brasso are available in most countries. Hope this helps to explain my earlier comments, and don't forget to use eye protection if you do try. Paul S.
Topic: help with info. on flint Daum vase. (Read 2864 times)
