1 From the secondhand account, the reader gets more background information about what the Oregon Trail was. 2  From the firsthand account, the reader gets a better understanding why it was so dangerous.
Printers generally age more by the number of pages printed rather than by pure years. The rule of thumb has always been whatever the recommended volume is (for instance 5000 pages per month for a P3005) multiplied by say five or six years so about 300,000 pages would be the life expectancy of the printer.
Think of your newspaper, for example, which is based on the lower pH levels. Carefully stored, it can have a life expectancy of up to 20 years. Left to light and air which trigger its deterioration, it may last only a few weeks. Acid free means that the paperâs pH is 7.0 (neutral) or higher (alkaline). Acid free papers will last up to 200 years under normal use and storage conditions. Does your direct mail piece really have to last this long? It would be so easy if a paper that is acid free could also be considered permanent. But, you guessed it â¦