| Show wall paper prof bernbeck Bern bech writing tu the medical press calls attention to the danger arising from the use of ultramarine wall papers he states that a room hung with an ultramarine tr colored paper gave out a moat disagreeable smell of sulphur betted hydrogen the source of which for some time escaped detection eventually however a close examination was made of the paper which led to the conclusion that the deep blue wall paper waa slowly undergoing der going a process of decomposition under the influence of tha alum in the paste used in hanging this appeared to bo confirmed for on steeping a piece of the paper in a very dilute solution of alum it aavo off sufficient ted hydrogen to be quite perceptible to the noso and t blacken lead paper |
