Like you, I'm rather attached to newsprint, in particular "Richeson newprint". The tooth and tone of the paper is perfect for charcoal. I've looked for an archival paper that is identical in tooth and tone to Richeson but haven't found one yet. The closest is Strathmore 400 series but the tone of the paper is yellowish cream and not grey. I have resorted to taking high resolution photographs of drawings as a record of progress mainly, which can be printed later. Another option is to deacidify the paper using a deacidification spray like "Bookkeeper Deacidification Spray". Google that phrase. Expensive but probably goes a long way if you spray the newsprint drawing you want to keep.

If you want to keep using newsprint (frustrating when a 'practice' piece ends up turning out quite nice on newsprint!) one idea is to take a high quality photo of the things you want to keep, then later you can make a print of it later if you would like to.

Well depends on where you live... In China we have a type of paper called Dowling paper, they have light and heavy weight variations, widely available as 80gsm whih is just a tad thicker than newsprint, originally produced by that company in England, it's basically glazed printing paper, good for pencil and pens, but I'm not sure what's that called in the rest of the world, apparently in EU and US they use more brand names than paper category names. Another brand you can keep an eye on is Tome River paper from Japan, very thin and durable, but I'm not quite sure that paper is suitable for pencil because it's very very slick. But that's good for pens. Not widely available as big sheets though.

The whole point of using newsprint is that it's cheap and disposable, so you can do a LOT Of drawings without getting precious about your materials. There's no such thing as "archival newsprint," you'll need to step up to a proper drawing paper. Canson, Strathmore, Borden & Riley, etc. all make acid-free sketch and drawing pads that are decent quality but won't break the bank.

I use newsprint specifically for 'throw away' practice work. I do quick gesture studies on it usually, but I don't intend on keeping any of them. I think newsprint will always yellow after a while, but it is great for practice because it is cheap. If you want something that will last longer I would get more expensive drawing paper.

Hello! Personally I only use newsprint for sketching and practise drawings because its cheap. I don't therefore mind so much when it buckles, discolours or rips. If I was going to work really hard on a drawing I would probably choose something much thicker that would last a bit longer.