Following-up on the suggestion, I found similar envelopes called ‘Claer Front’ quite widely available and used by cigarette card and postcard collectors. I bought a quantity sized 3.50 x 2.25 ins and others 4.50 x 3.00 ins. The former are closest to the old negative wallets I used to be able to buy, but are just too tight a fit for 6 x 6 cm negs. Rather than re-package all my existing negs into the larger size, I have set aside all my remaining old stock for 6 x 6 use and use the new, slightly smaller envelopes for 35mm and other small format negs. If I were starting from scratch, I would go for the larger size, as not only is it more than okay for the 6 x 6 (or 2.25 ins. sq. in old money) and 6 x 7 cms, but will also take the old 116 size negs, of which I have a number.

I bought these envelopes from Rob Roy Cards, Crosshall, Chelsfield Village, Nr Orpington, Kent BR6 6EN, for the princely sum of £1.00 per 100 for both sizes, plus postage. They have a website at http://www.robroyalbums.co.uk where these wallets can be ordered and paid-for by credit/debit card. I have no connection with this firm other than as a so far satisfied customer. One thing to note is that the Clear Front wallets do not take ball-point, felt tip or other inks at all well. I solved that by buying a reel of 1,500 suitable-size white sticky labels on eBay for just over £2. The labels stick very firmly to the clear or the opaque side of the wallet and accept all the above ink types, plus pencil.