A man in Ohio spent three weekends scanning every photo in his late mother's albums. Hundreds of images, captured on his phone, propped against a window for the light. Then he gave the original albums to a cousin to free up the closet. Two years later, his phone was stolen at an airport. No backup. Everything gone — twice.
That story has a quiet lesson buried in it, and it's the same lesson hiding inside every yellowed letter and brittle wedding dress in your house. You can't fight decay object by object. You fight it by controlling the world the object lives in.
Here's the thing almost nobody gets told. Decay isn't an accident, and it isn't bad luck. It's chemistry, and chemistry follows rules. A cheap newspaper from the 1990s crumbles in twenty years. A handwritten letter from the 1820s is still soft enough to fold. Same drawer, same house — and the old one is the survivor. That's not because someone cared more. It's because of what each thing is made of, and what the air around it has been doing ever since. Once you understand the handful of forces at work, you stop needing a checklist. You can look at anything and know what it needs.
So this course gives you those forces, one at a time. There's a moment where you'll learn why humidity, not heat, is the real killer — why the same shoebox has three different futures depending on which shelf you set it on. There's a section where Mary Lynn Ritzenthaler, who runs the conservation lab at the National Archives, explains how a single bare thumbprint surfaces as a permanent stain months after you touched the photo. You'll learn why the word "archival" on a box means absolutely nothing, but "passed the PAT" means something a photograph actually had to survive. And there's the box of cassettes in your closet that's on a timer no storage can stop. By the time this is done, you'll be able to spot the threat in any heirloom, choose what actually protects it, and know the one moment to put it down and call a professional.
The place to start is the simplest question of all — why these things fall apart in the first place, even sitting untouched in the dark.