Among the recent visitors was Steve McCurry, a photographer whose work has appeared for decades in National Geographic including his well-known cover portrait, shot in Kodachrome, of a Afghan girl that highlights what he describes as the “sublime quality” of the film. When Kodak stopped producing the film last year, the company gave him the last roll, which he hand-delivered to Parsons. “I wasn’t going to take any chances,” he explained.

At the peak, there were about 25 labs worldwide that processed Kodachrome, but the last Kodak-run facility in the United States closed several years ago, then the one in Japan and then the one in Switzerland. Since then, all that was left has been Dwayne’s Photo. Last year, Kodak stopped producing the chemicals needed to develop the film, providing the business with enough to continue processing through the end of 2010. And last week, right on schedule, the lab opened up the last canister of blue dye.

Kodak declined to comment for this article.

The status of lone survivor is a point of pride for Dwayne Steinle, who remembers being warned more than once by a Kodak representative after he opened the business more than a half-century ago that the area was too sparsely populated for the studio to succeed. It has survived in part because Mr. Steinle and his son Grant focused on lower-volume specialties  like black-and-white and print-to-print developing, and, in the early ’90s, the processing of Kodachrome.

Still, the toll of the widespread switch to digital photography has been painful for Dwayne’s, much as it has for Kodak. In the last decade, the number of employees has been cut to about 60 from 200 and digital sales now account for nearly half of revenue. Most of the staff and even the owners acknowledge that they primarily use digital cameras. “That’s what we see as the future of the business,” said Grant Steinle, who runs the business now.

The passing of Kodachrome has been much noted, from the CBS News program ”Sunday Morning” to The Irish Times, but it is noteworthy in no small part for how long it survived. Created in 1935, Kodachrome was an instant hit as the first film to effectively render color.