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Showing results for tags 'chemicals'.
Found 2 results
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Hi all! I did an experiment yesterday by putting a pH indicating dye on a strip of maple. I let that dry, and then applied 5% sodium nitrite solution to it, and placed it in the light box. To my surprise, only after a few minutes of light exposure the dye changed from orange to a cool red, indicating the presence of a base. I had always thought that nitrite reaction produces nitric acid, so, I’m very confused as to why this test indicates as alkaline. Anyone have a possible explanation? Also, I’m wondering if this is a good approach to create a pH neutral treatment? I’m not a chemist, but I imagine one could find the proper salts to add, to make sure the dye does not change color through the process.
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Hi guys! So, I'm doing a retouch on an old trade violin that has spirit varnish. I know that it's somewhat futile to discuss colors without actually showing an example (I'll be approved for pictures soon!), but I'm looking for a varnish that's deep cherry red... much more red than brown. I've thought of making my own 1704 varnish and adding dragon's blood.... but then I saw that one could also use henna, or cochineal, or madder root.... or I could just buy red pre-made varnish from Kremer pigments, and maybe some brown in case I need to adjust the color. So basically, now I'm overwhelmed with choices. Does anyone, from experience, have some endorsements for a nice deep but vibrant red? Anyone know what would typically be used to color a cheap varnish red.... so maybe I can use the same thing or something close to the original? Also.... how much variance is there in the types of reds the common red colorants yield? This is where some first hand experience or advice from those with lots of experience would come in handy! Thank you much for any thoughts you all may have!!!! -Sarah
