We keep all in zip lock bags, dry. Nothing like iPhoneñ‰õµ On Mar 3, 2010, at 8:19 AM, Gary D Lynne <[log in to unmask]> wrote: > Just wondering if anyone else has experienced "shelf-life" issues > with the IF AT forms. Had some 3-year old "gold flake" (in contrast > to the "silver flake" ) forms left over... so, with extremely > limited teaching budgets, tried to use them last night. I had not > "tested" them for whether they would scratch or not (who would have > thought to do so??) ... they would not scratch! The gold flake > was "welded" to the form. So, had to go to "Plan B" in the midst > of the Exam... with several very disappointed students, who really > do like the IF AT scratch-off process... gaining more points, as > well as learning more, due to immediate feedback. (Not good for > student evaluations.. that the forms did not "scratch"). > > Now I am wondering about the "silver flake" forms... how long do > they last? I teach small classes (typically 50-something), so the > large quantities the IF AT supplier requires us to buy results in > "stocks" of these things sitting in my office for awhile. > > Any one else having trouble with the scratch-off forms? > > Gary D. Lynne, Professor > Department of Agricultural Economics and > School of Natural Resources > 103B Filley > University of Nebraska-Lincoln > Lincoln, NE 68583-0922 USA > Website: http://www.agecon.unl.edu/facultystaff/directory/lynne.html > Phone: 1-402-472-8281 Cell: 1-402-430-3100 > This message and any attachments are confidential, may contain > privileged information, and are intended solely for the recipient(s) > named above. If you are not the intended recipient, or a person > responsible for delivery to the named recipient, any review, > distribution, dissemination or copying by you is prohibited. If you > have received this message in error, you should notify the sender by > return e-mail and delete the message from your computer system and > destroy any copies in any form. > > "We are always only one failed generational transfer of knowledge > away from darkest ignorance" (Herman Daly) > "We do not just have our own interests. We share interests with > others. Empathy ... exemplifies the implicit solidarity of human > nature" (Robert Solomon) > "Whoever frames the debate tends to win the debate" (George Lakoff)