I personally value my pens far too much to use an ink containing iron gall in any of them so any slight concern would be enough for me to choose something else.
I happened to look at the Cult Pens site to see what they said about Platinum inks and
they mention the same warning.
They also mention that Platinum Blue-Black is actually a fairly standard blue colour so as there are probably hundreds of similar ink colours in that range available why would you need to take any potential risk? If you use it in your Nakaya and it's damaged as a result the manufacturer has an easy get out.
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