Which of the following is one of the most common inhaled poisons associated with fire?

Each of the following statements regarding testing for darkroom light leaks is correct EXCEPT one. Which one is the EXCEPTION?

a. All lights, including the safelight, should be turned off. b. White-light leaks may be marked with tape or chalk so that they can subsequently be sealed. c. White-light leaks are visible as soon as the lights in the darkroom are turned off. d. Possible sources of light leaks include around the entry door and around pipes leading into the darkroom.

How often should pharmacy weights be calibrated?

Once a year Every 8 months Every 6 months Every month