My grandma's spaghetti sauce card has 3 stains I could never replicate, unlike @riley_ellis's aunt's perfect lemon bars. My cooking just adds NEW stains to the kitchen walls.
Oh man, I know exactly what you mean. My aunt's handwriting on her lemon bar recipe card always gets me. There's just something about the stains and notes that you can't get from a website.
I saw a news story last year about a museum show on old community cookbooks. The person running it said the stains and handwritten notes were the best part because they proved people actually cooked from them. That's why holding those cards feels like a real link to the past, not just reading a recipe online.