u/Zencigt

I hace recently built my own home-lab and I am looking to get concentrated sulfuric acid so I can make fuming nitric acid for a project. I've seen on various tutorials that I needed sulfuric concentrated up to 96-96%, mixed with potassium nitrate. On my local hardware store, I only get about 15% so I'm looking to purify it. My heating plate only gets up to 270 C°. So my question is, can I try to purify as much as possible (about 80%) and make my nitric acid, or do I necessarely need 96% concentrated acid. And if so, do I proceed to distill it with a flame ? (ik its dangerous but I would take all security mesures to do so) Thanks in advance for all your responses appreciate u gang