would this work on a nickel/copper mixed metal?

This is for solder and lead... look for a formulation for copper for the best results. Liz Renee, Nartique Glass, Casselberry, FL

Is this a true deep black or more of a very dark silver?

I wouldn't say it's a true deep black, just makes the lead blend-in with old weathered lead (kindof super dark grey, nearly black). FYI: have an old historic home and I can't really tell the difference between the new lead and the rest of my 100+yr old lead in my front windows. However, unfortunately, if you look closely, the new lead piece between the glass (or center of the "I" beam cross-section) is still bright silver since I didn't think to coat the center of the lead strip before installing. Anyhow, if you use this and don't want the lead to look bright silver anywhere, I would suggest coating the inner strip before installing, and then re-coating the outside after it is installed...

Any tips for using it on brass? I have tried and it looks great at first but when it dries, it looks like the brass is rusting underneath

I haven't used it on brass, I bought it to finish a stain glass repair but after playing with it (rubbing it in every surface I found in my garage) I found out that gives an aged patina to zinc plated finishes, like those common shiny bolts you get at the hardware store. I'm sorry I can't help you with your question.

Will this stain my bathtub after rinsing the stained glass?

Should not the overall bathtub, but any metal parts it will. I would suggest rinsing out side.

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🖤 Elevate your solder game with the sleek black patina that means business.

PERFECT 8 OZ SIZE - Generous volume for multiple projects without constant repurchasing.
READY TO USE POWER - Premixed formula saves time and effort—just apply and go.
SLEEK BLACK FINISH - Transforms solder joints with a professional, corrosion-resistant patina.
NO BATTERIES NO FUSS - Completely chemical-based, no power source required—work anywhere.
TRUSTED NOVACAN QUALITY - Industry-leading brand ensures consistent, reliable results every time.

Novacan Black Patina for Solder is an 8 oz premixed solution designed to provide a durable, deep black finish on solder or lead joints. Ready to use straight from the bottle, it enhances both the appearance and corrosion resistance of your metalwork, making it a must-have for professionals seeking flawless, long-lasting results.

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Manufacturer	Novacan
Part number	LGNBPFS
Item Weight	0.28 g
Product Dimensions	20.32 x 5.08 x 2.54 cm; 0.28 g
Item model number	LGNBPFS
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

Novacan Black Patina for Solder

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