Date: 22nd September 2011
Wind Speed: 0 knots
Temp with wind chill: -41°C
I have just finished treating two boxes of ‘Tabloid Potassium Metabisulphite’. It was used in the developing of photographs, probably by Herbert Ponting, the photographer on Scott’s Terra Nova expedition.
The staples holding the boxes together were completely corroded away with just corrosion staining remaining. One of the boxes had leaflets describing the types of chemicals available and what they were used for. There was even a ‘Special Caution’ note on the risks of buying inferior products.
The brown glass bottle inside contained tablets of the chemical. It was sealed with wax over the cork.
A leaflet from one of the boxes. © Jane/AHT
The surface of the cardboard and paper was blistering due to the presence of salts so I decided to wash them. I did this in a bath of water, with the paper and card supported on a piece of spun-bonded polyester. I then allowed them to dry before humidifying them and reassembling the box.
I consolidated the wax on the cork stopper as it was flaking. I also consolidated the surface of the cardboard as it was quite friable, probably as a result of the salt damage.
A box after conservation. © Jane/AHT
With the individual elements stabilized, I was then able to put the bottles and leaflets back into the boxes.