alternative you could try to buy Data Tresor DVD's and burn the pictures on them...they should last a while...main challenge will be to find a place to buy them and their webpage looks utter pants.
Also once you burned them on disc you need a good place to store them....
More details under the link below:
http://www.storagenewsletter.com/news/optical/datatresordisc-northern-star-essilex
Extract:
It's a standard 12cm 4.7GB DVD+R but with a completely different recording layer. It's not organic substances from the group AZO, cyanine and phthalocyanine. "The disadvantages of the organic materials are the crystallic structure that absorbs humidity and the material properties change with time due to the impact of light," said Northern Star. DataTresorDisc is based on on metal-ceramic and semi-metal recording layer. "Compared to standard DVD+R, none of the recording layer materials is subjected to natural aging process nor does it corrode," adds Northern Star. The two substrates of 0,6mm thickness are produced from polycarbonate resin but the company is exploring glass, offering higher longevity.
This new optical disc is guaranteed for more than 100 years and the Czech engineers speak about 160 years following their own testing.
Price is acceptable: €4.10 per disc sold in a 10 or 25 cake for a small quantity ordering, wrote MOS Magazine.
Relatively small inconvenience: to write on this DataTresorDisc you cannot use all the DVD writers and all the burning software but the company give the list of the recommended products that are available on the market. For the software, there are only two: CDBurner XP and Ahampo Burning Studio 10 for Windows with no more than 4X speed because the media probably needs a powerful laser. Several models of Asus, LG, Lite-On, Plextor and Samsung are able to burn the discs. MOS Magazine has even burned few media using two LG and Lite-On drives with CDBurner XP, and then tests them with Nero DiscSpeed 5 and Opti Drive Control, to finally getting good results.