Siman 350
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א אִם רָצוּ, מַתִּירִין שְׂעָרוֹת לְכַלּוֹת, וּמְגַלִּים פְּנֵי חֲתָנִים, וְנוֹתְנִין דְּיוֹ וְקֻלְמוֹס בְּצִדּוֹ, וְתוֹלִין מַפְתְּחוֹ שֶׁל מֵת וּפִנְקָסוֹ בָּאֲרוֹנוֹ, מִשּׁוּם עָגְמַת נֶפֶשׁ. וְעוֹשִׂים חֻפּוֹת לַחֲתָנִים וְכַלּוֹת, וְתוֹלִין בָּהֶם דְּבָרִים שֶׁלֹּא הֵבִיאוּ אֹכֶל נֶפֶשׁ; אֲבָל דְּבָרִים שֶׁהֵבִיאוּ אוֹכֵל נֶפֶשׁ, אָסוּר, מִפְּנֵי שֶׁהֵם נֶאֱסָרִים בַּהֲנָאָה.
1 If one desires one may untie the hair of [dead] brides and uncover the faces of [dead] grooms, and one may place ink and a pen at his [the dead person] side, and one may hang the dead person's key and writing-tablet on his coffin because of grief of the soul, and one may set up canopies for [dead] brides and grooms, and one may hang upon them only that which is inedible, but anything that is edible is prohibited [to be hung thereon] since they become forbidden for use.