how good is the data reliability with CD ROM and DVD RAM?

[Chuck Guzis]

On 07/22/2018 05:46 PM, Warner Losh via cctalk wrote:
> Somewhat of a tangent, but this just popped up for me.
> 
> https://www.theatlantic.com/technology/archive/2018/07/microfilm-lasts-half-a-millennium/565643/

I read through to the end of the article and can't quite see where the
500 year lifetime comes in.  Microfilm is a Mylar base with a gelatin
coating containing bits of elemental silver, no?   Why would this last
for 500 years?  Do we even have a 250-year old piece of intact gelatin?

--Chuck