Toning glasses, glasses; Autofilters

Make a 20% solution of rosin in caustic soda (NaOH); Dissolve rosin until the liquid becomes dark yellow. After filtering, add a little solution of ferric chloride (FeCl3) or ferrous sulfate (FeSO4); Iron salts take a little. A precipitate of iron is formed, it must be separated, washed, dried; Then dissolve in pure gasoline-solvent, and best of all - in pure hexane or non-ether ether. The solution is sprayed with a spray or brush evenly onto the glass, which must first be cleaned, degreased in a soap-soda solution, rinsed and dried. After applying the color solution, the glass is dried, then placed in the oven for 5-10 minutes at t = 600 degrees C, after which a strong and thin brown film forms on the glass. If you use other chlorides, you will get different colors: copper chloride - green; Cobalt chloride - blue-blue; Chromium chloride - emerald-ruby; Zinc chloride - milky white; Lead chloride - yellow. Regulating the concentration of rosin and metal salt, you can get a different saturation of the film on the glass. Work should be in rubber gloves, in a ventilated room. Experiment first on pieces of glass, record, fix regimes, concentrations, temperature, time and other details.