Bought this pine gum rosin to make flux but is not dissolving, any

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DIY rosin flux solids

Bought some flux and asked the guy specifically if it's for electrical work : r/AskElectronics

Rosin - Wikipedia

Rosin: Recent advances and potential applications in novel drug delivery system - Bhupendra Kumar Yadav, Bina Gidwani, Amber Vyas, 2016

Premium Quality Pine Resin/ Colophony, Gum Rosin, 100% Pure, Flakes, WW Grade, Various Quantities

Rosin Glazy

Rosin In Soldering Fluxes: A Complex Material, Indium Corporation Blogs, Flux, Liquid Flux

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Did you know your flux may be made of tree sap? Rosin dissolved from pine sap and was used in early electronic development. Flux's main purpose is to, By AIM Solder