. It’s obvious: Bacon inserted those words before disappearing, to send some sign to those who will then welcome Saint-Germain in one court after another, as an expert in dyes. . . .
The joke is that Agliè who has presented himself as the immortal Saint-Germain and expertly immersed in conspiracy theories, in the histories, went around grifting rich people and pretending to be an expert in dyeing. I highlighted this passage because it's very similar to above in that the Diabolicals must appear mysterious, and they'll do that in the most stupid ways.