Reading Pitum HaKetoret From A Klaf

Reading Aruch HaShulchan the other day, I saw a cute practice. He writes (IIRC he was citing someone) that because by saying korbanot it is like offering it, one should be careful to say pitum haketoret, the list of the ingredients that make of the incense offering, without omitting any ingredient. Indeed, one should say it from a text. This is because we say at the end of it ve-im chisar achat mikol sammaneha chayav mita, "and if he left out one of the ingredients he is liable to death."

Thus, it is a bad thing to leave out any ingredient, even by accident (though the Aruch haShulchan obviously would not say we would administer the death penalty to someone who misspoke, even when capital punishment was in existence). Aside from this, it is a list of arcane ingredients, and if one wants to say over the list correctly, it is appropriate to do it from a text. All in all, cute, good encouragement of Jewish practice, and taking certain halachic principles to their logical conclusion.

My father pointed out a practice which he believes stems from this. At the relevant part of davening, when it comes to this point, he has seen people put down their siddur and take a rolled up parchment out of their pocket. This parchment has the relevant text, written in ketav ashurit, but as would be written in a sefer Torah. They read pitum haketoret from this.

Indeed, in my shul, someone donated a parchment, framed and behind glass, which has the text of pittum hakketoret on it, so that people can go over to it and read it from the parchment.

If this is indeed the source of this new custom (and it surely seems so), then it is silly. The requirement to read from a ketav is not meant as a requirement to read from a kelaf. The entire purpose is so as not to make a mistake of omission, and this is accomplished just as well from a siddur. It would provide insight into how new custom develops.