They claim that water has a memory and so therefore despite a 30C dilution containing not one molecule of active ingredient the water retains the memory of the ingredient and this is from where the remedy gets its potency. The more diluted the more potent. If there is anything wrong with my understanding of this then I invite homoeopathists to correct me in the comments.  

My simple test is this;

1. Take 10 different 30C remedies; Heph Sulph, Pulsatilla, Lycopdium, Arnica, Apis Mel, Argent Nit, Sepia, Thuja, Kali Phos, Kali Bich. (Purchased from your local Boots store of course)

 2. An independent adjudicator should now place the remedies in 10 separate numbered containers being sure to make a record of the numbers to the corresponding remedy. This should be done away from prying eyes.

 3. Another independent adjudicator should now take these containers and pass them to a homeopathic practitioner.

 4. The homeopathic practitioner is free to conduct as many tests as they deem necessary to identify what remedies correspond to what numbered containers.

 5. Should they be able to identify correctly all ten remedies then this would provide some evidence that despite the 30C dilution the remedies still contain some ‘memory’ of the initial active ingredient.

Please Note

While this would not completely convince me that homeopathy worked it would go a little way to proving the fundamental memory premise. While 10 out of 10 may seem a little strict should a similar test be done with 10 traditional medicines, aspirin, paracetamol etc I am confident a chemist would correctly identify 10 out of 10.  

It would be great to hear what simple tests you would devise for homoeopathists to take to show the fundamental science behind their ‘medicine’ is sound. Alternatively I would like to hear from homoeopathists as to what evidence would convince them that homeopathy doesn’t work?