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nepheline

india ink or what else ?

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Ahh, good point Callie.  I was so busy looking for materials I ignored the context. 

Though I don't think it's food safe, I wonder if registrar's ink would work. It's an ink used when officiating weddings over here; it gets darker over time for a better record in the wedding records for signatures etc.  I think it's an iron gall ink.

https://en.wikipedia.org/wiki/Iron_gall_ink

 

Edited by hantremmer

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Thanks for the suggestions and comments.  Partly, I'm intrigued by the idea of using an ink that's designed to last and to see what happens - even if there are tried and testing ways of acheiving the same look.

 

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Ware we getting precious here.

Probably ingest/absorb more baddies walking down the average street.

What poisons are in Indian ink??

The total body load on intake over a lifetime to be considered

Just saying 

After a number of washes as said above the stain in your mug would be more tannin than anything...

 

Poor washing and personal hygiene more health threatening imo

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11 minutes ago, Babs said:

What poisons are in Indian ink??

I believe they are made from soot and some have binders added. I'm wondering about tattoo ink. 

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A quick Google search for India ink MSDS reveals that most brands are certified non-toxic. As Min says, it's just lampblack. Will it kill you? No. Is it foodstuff? No.  

Check for a MSDS for the brand you use just to be sure: the binders that different manufacturers use might affect things.

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