Old school incandescents from a rummage sale - restore them or leave them in the box?

I'm in the shelf camp, mostly because I watched a set from my grandmother's attic lose two bulbs in one evening. That was a Noma string from probably the late 50s, and the insulation near the plug had gone stiff enough that it cracked when I coiled it up. Nothing caught fire or anything dramatic, but it was enough to make me stop plugging in anything older than my dad.

What I do instead is put a couple of the pastel bulbs in a little wooden box on the mantel next to some fake snow and a ceramic tree. They still get seen, and honestly people ask about them more than they ever noticed the lights on the house. The packaging alone is half the charm, that faded cardboard with the store sticker on it.

That said, I get the pull. My neighbor across the street runs a vintage set on his porch rail every December and has for years, no trouble. He just checks the wire by feel for stiff or cracked spots before he strings it and never leaves it on overnight. So it clearly works out fine for some people, I just don't trust my own old strings that much. If those bulbs of yours came in sealed boxes, I'd lean toward keeping them mint. Opened and used, they're just pretty bulbs. Sealed, they're a little piece of the era.

I light mine, and I have for years, but I split the difference in a way nobody seems to talk about. I use the vintage bulbs on modern wiring. The glass and the paint are what make those old pastel bulbs special, and glass basially lasts forever if you don't drop it. The wire and sockets are the part that ages badly, so I screw my grandmother's old C7s into a cheap new string from the hardware store and call it a day. The look is nearly identical to the real deal. That soft peach and mint glow on the mantel is the whole reason I kept the bulbs in the first place, and honestly a few hours a season on fresh wire is no diffrent than running any light set I'd buy today. My uncle did the full purist route, original wire and all, for a string from the early 60s. It worked fine for two Decembers, then a socket cracked when he bumped it while dusting. No drama, just a dead section and a lesson. He still displays that string, but now it sits coiled in a bowl on the coffee table as a centerpiece, unplugged. So my take is you don't acutally have to pick a camp. The shelf folks are right about the old wire, and you're right that the glow is worth having. Just put the old glass on new wire and you get both.

I'd push back on the idea that the bulbs themselves are the safe half of the swap. Glass yes, but those old painted finishes aren't invincible. I ran some pastel C9s from my aunt's basement on a new string two seasons back and by the end of January half of them had gone blotchy, the pink fading to a sad white where the paint baked off. Filaments are also fragile after decades of being rattled around in boxes, so don't expect them to survive handling the way a new bulb would.

If you do try it, keep them on a short run and look at them up close after a few evenings. That'll tell you real quick wheather the paint is holding or cooking.

One thing I'd add to the shelf side of the debate is that storage conditions matter almost as much as the decision to light them or not. I kept a box of my mother's old C6s in the attic for years and the sun-faded cardboard and heat did more cosmetic damage up there than two decades of December use ever did. If you're keeping those sealed boxes as display pieces anyway, they're better off in a closet or a display case away from a window, since UV will fade that pastel paint just as surely as a filament will.

Update: went with the hybrid idea from the second reply. Put the pastel bulbs on a modern string and they look great on the mantel. The blotchy paint warning made me keep them away from the window and out of direct sun, and they're stored in a cool closet now instead of the attic. Two boxes of bulbs cost me less than dinner out, so if a few fade I won't cry about it.