Indicators change color gradually across a pH range, and it is common for one of the indicator's forms to be colorless. Since indicators are weak acids, care should be taken to avoid adding too much indicator (more than 3 to 4 drops per 100-mL) to a solution of acid or base.
Roast your pork shoulder in the oven at 350 degrees F for 30 to 35 minutes per pound for a nice slicing roast. At this temperature, a 6-pound pork shoulder will require 3 to 3 1/2 hours to roast. Check for doneness by placing a meat thermometer into the roast at the thickest point. Be careful not to touch the bone.
Place the ham in your preheated oven and roast until the internal temperature reaches 165 degrees Fahrenheit. A meat thermometer inserted into the picnic shoulder will help you to determine when the meat is done. Allow about 30 minutes per pound cooking time.