Nick, I did a little googling and found some interesting info on pickled eggs and concerns about botulism:
Note of caution:
There is a potential risk of botulism. Here are the facts surrounding home canning pickled eggs:
The NCHFP (The National Center for Home Food Preperation) states that home canned pickled eggs should always be refrigerated at 39 degrees F (3.8 C) or lower. The reason for this is that botulism can grow in the following conditions: • No Oxygen
• Temperatures above 39 Degrees F
• Where the PH value is greater than 4.6
What does this mean? • There is no oxygen inside of the canned jar which could breed botulism.
• If unrefrigerated, the temperature inside the jar will be above 39 degrees (also can breed botulism)
• But the recipe calls for 5% acidic vinegar, which has a PH of 2.4 – which prevents botulism from growing
Hard boiled eggs have a PH around 6.8 – So it is possible for botulism to grow because the vinegar does not penetrate deeply into the egg. Therefore, you must make sure your peeled, hard boiled eggs do not have any cracks, cuts, splits or tears in them. They should be blemish free. Doing this will prevent botulism spores from entering the egg.
The following points are the most critical to ensure safety from botulism: • All peeled eggs used should be free of nicks, cuts, holes or punctures
• Use all vinegar with a 5% acidity level, do not cut with water
• Cooking times and temperatures related below should be strictly adhered to
• Sterilization of all jars, lids, rings, and paraphernalia is required
What is the probability or risk of getting botulism? • On average, in the USA, there are 23 cases of botulism per year. (out of 450 million people)
• Millions of home brewed pickled eggs are consummed each year.
• There has only been 1 reported case of botulism caused by home pickled eggs, back in 1997.
See: Botulism in Pickled Eggs – In this report you will read that this individual did a number of things wrong when he prepared his pickled eggs.
If you have any doubts about canning pickled eggs, simply refrigerate your jars.
If you do choose to keep your canned eggs un-refrigerated, you should keep them as cool as possible and out of direct sunlight.
The following recipes assume you are experienced with canning and all the safety requirements that go along with canning, such as: Keeping everything sterile, washing your hands, rinsing the eggs and pre-heating them to kill any surface spores before packing in the jar etc.
Having dispensed with the litigical requirements, onto a mouth watering treat: