I’m not being pedantic and the definition of ‘blind’.
You are presenting this as a scientific experiment. In a scientific experiment blind is as I have described it. Believing that you no not know what will be observed does not make it a blind test.
I did not invent the double blind experiment, someone far smarter than me did and if you want to show that the holder has no influence on the outcome that is what needs to be done.
Clearly you care about showing that this particular effect is real so do a proper double blind study to prove it to yourself if nothing else.