Anyone care to share their favorite permanent ink additive - mix of permanent ink + X ink ? While I enjoy Platinum Classics, Sailor nano pigs and Noodler's, it would be great to add a touch of permanence to the rest of my inks. I'm guessing Platinum Carbon Black would be a good stable additive but that was only one test run So far: Success: Platinum Carbon Black (just a smidge) + Noodler's 54th Massachusetts - stableFailure: R&K Salix + Maruzen Blue: the mix writes but precipitates all along the inner demonstrator barrel Ideal: Permanent reveal at 07:15 shows color washout but line is still visible. So the mix would be like this true Platinum Classic: color shows but when water is applied, at least the "permanent" iron gall burn still shows for archival review. https://youtu.be/kcWfuu05Dig Other mixes found: https://www.fountainpennetwork.com/forum/topic/293552-mixing-permanent-inks-with-inks-which-are-not/https://www.fountainpennetwork.com/forum/topic/135497-mixing-inks-sailor-nano/page-3