ok Ian..lets get to the bottom of this. You say she is worried about the shade of burgundy. In what way? Does she want it to match the material exactly? If that is the case, then you will have an impossible task. You've only got to fire up something like Photoshop to find out how many different shades of burgundy you can produce. If you commit yourself to doing what it appears you are trying to do, then you have a 1/1000 chance of getting it perfect and you will no doubt be refunding the price of the wedding in due course. I've done quite a few weddings with burgundy calas and have never had any complaints about the colour not matching. Such is mother nature, and wouldn't it be a boring world without some diversity. Burgundy is Burgundy, whether it be pale, medium or dark, it is still burgundy and as such will blend in with the colour scheme. Of course, if money is no object and you have a 'blank cheque' then i dare say there are ways of achieving the 'impossible' with a little help from professionals.