 | 1903 - 456 pages
...simultaneously. 4. The action must be carefully watched, so as not to be too long continued. Lastly, very old writing which has become brown by age, although...the action of weak solutions of bleaching powder and peroxide of hyiirogen, will show signs of giving way almost instantly when acted upon by dilute nitric,... | |
 | 1909 - 612 pages
...carefully watched, so as not to be too long continued. Lastly, very old writing which has become browu by age, although it resists the action of weak solutions of bleaching powder and peroxide of hydrogen, will show signs of giving way almost instantly when acted upon by dilute nitric,... | |
 | United States. Bureau of Standards, Campbell Easter Waters - 1936 - 64 pages
...simultaneously. 4. The action must be carefully watched, so as not to be too long continued. Lastly, very old writing which has become brown by age, although...show signs of giving way almost instantly when acted upon by dilute nitric, hydrochloric, and oxalic acids. To put "precaution" 2 in other words, unless... | |
 | 1936 - 798 pages
...simultaneously. 4. The action must be carefully watched, so as not to be too long continued. Lastly , very old writing which has become brown by age, although it resists the letion of weak solutions of bleaching powder and hydrogen peroxide, will show rigns of giving way almost... | |
 | 1940 - 652 pages
...simultaneously. 4. The action must be carefully watched, so as not to be too long continued. Lastly, very old writing which has become brown by age, although...show signs of giving way almost instantly when acted upon by dilute nitric, hydrochloric, and oxalic acids. To put "precaution" 2 in other words, unless... | |
 | 1888 - 706 pages
...so tampered with can be restored by the application of gallic or tannic acid. In determining the age of any particular writing, the following precautions...on by dilute nitric, hydrochloric, or oxalic acids. PHARMACOPCEIA OF THE PHILADELPHIA HOSPITAL. (Continued from page 317.) Pulveres Bismuthi el Opii. Each... | |
 | 1888 - 684 pages
...so tampered with can be restored by the application of gallic or tannic acid. In determining the age of any particular writing, the following precautions...on by dilute nitric, hydrochloric, or oxalic acids. PHARMACOPOEIA OF THE PHILADELPHIA HOSPITAL. (Continued from page 817.) Pulveret Biimuthi el Opii. Each... | |
 | 1888 - 480 pages
...simultaneously. 4. The action must be carefully watched so as not to be too long continued. Lastly, very old writing which has become brown by age. although...the action of weak solutions of bleaching powder and peroxide of hydrogen, will show signs of giving way almost instantly when acted upon by dilute nitric,... | |
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... (3) The bleaching solution must be exceedingly dilute, otherwise the action is so rapid and powerful, that both old and new •writings are removed almost simultaneously. (4) The action must be carefully watched so as not to be too long continued. 