@ypercubeᵀᴹ Since "writing" is modified by an adjective, "normal," rather than an adverb, I would not say it is a gerund. It's just a noun. But "using" is certainly what Huddleston and Pullum would call a
gerund-participle. I don't know whether it would be classified as a "gerund" or a "participle" by people who do distinguish these categories.