did you use lee lira's recipe ?
from what it looks like on the zebra plate website
you might be able to substitute 5ml many stock developers with 3g of thiocyanate in 300ml of water
rockland colloid used to use Dektol as their stock developer to mix in the thiocyanate into
( the site owner uses LQN )
if you click on time of development drop down
https://zebradryplates.com/how-to-us...late-tintypes/
it lists the Lee Lira's developer as well as the rockland developer
if you find a copy of the darkroom cookbook and Jill Enfield's book
you can also find a few developers in there too ( I don't have either books sorry )
it can be a finicky process !
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