What ingredients are currently used in the manufacture of ink for Safrus? Is there a different formulation for the paint that is used to dye tefillin straps/boxes?
This seems to be a good page to see.
For a more comprehensive source, see the Mishkenos Yaakov.
For retzuah paint, you can just use shoe polish. It doesn't require d'yo.
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The Sta"m Forum has a page with a well tested recipe for STA"M ink almost identical to the one in Kol Sofrim. I can't vouch for it because I buy ink, but the person who posted it is a professional who has written several Sifrei Torah.