bleach is sometimes used as a fungicide during stratification. Sulfuric acid is also used to help erode the seed coat so that moisture can penetrate into the seed and promote germination.
Take a look at the first couple links here:
http://www.google.com/search?hl=en&...d+stratify+seed
Anyway you can try this technique with some of your seeds and compare it with the results you get when you don't.
BTW, I don't understand the last steps, which appear to be the same:
>>and when they start to crack put them in a pot,
>>and after another 24 hours,
>>place them in the pot to let them grow?
Regards,
Matt