Kate Roberts ([log in to unmask]) wrote: : Vapour phase corrosion inhibitors - has anyone used them successfully for : the storage of iron objects indoors?Any information gratefully received.Kate : Roberts Problems with vapor phase inhibitors are both human toxicity and the need to maintain a sealed environment for effectiveness. If the environment can be sealed, relative humidty control with silica gel or even the use of non- oxygen atmospheres may be possible too. One idea we have been looking into is the use of vapor barrier plastics (like Marvelseal) to create pouches for iron objects. Before the bag is sealed, it could be flushed with nitrogen or argon, and an oxygen scavenger (Ageless) enclosed. The additional use of conditioned silica gel or organic scavengers (activated charcoal, permanganate beads) may not be necessary. Hope this isn't too technical. It just points to hope for archaeological materials. John Burke Head Conservator The Oakland Museum of California