Changes in hydrogen-ion concentration produced by growing seedlings in acid solutions

✍ Scribed by Jehiel Davidson; Edgar T. Wherry

• Publisher: Elsevier Science
• Year: 1924
• Tongue: English
• Weight: 88 KB
• Volume: 197
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(24)90816-7

✦ Synopsis

HmH-QUaLITY papers coated with brown print materials, now customarily used in this country, deteriorate with great rapidity at 65 per cent. relative hurfiidity and 7 °° F. Coated paper kept under these conditions for two weeks has less than one-fourth the folding endurance of the uncoated pape r . Therefore, brown print paper should be printed and developed within a week after it is coated.

The wet strength of coated brown print paper, stored at 65 per cent. relative humidity and 7 °0 F., is greater than that of the uncoated for at least sixteen weeks.

Papers of good quality coated with blue print mate:ials, now customarily used in this country, can be kept at least four months at 65 per cent. relative humidity and 7 °° F. without deterioration.

Long washing after developing (up to fifteen minutes), or machine drying for one-half minute at from 17o ° F. to 27 o° F., did not affect the brown and blue print papers examined.