In 1856 he announced his own oxymel process which allowed collodion negatives to be preserved over many days. This was hailed as a boon by the Illustrated London News of July 1856. They wrote ""We have heard of a new method of preserving collodion plates for a week or a fortnight discovered by Mr Llewelyn of Penllergare a gentleman to whom all photographers owe a world of thanks. The plates may be prepared at home and a boxful taken out and think of this ye tourists, as you travel along and a fine prospect meets your eye you have nothing to do but to stop your carriage, get out your camera, and in a few minutes you may secure a picture, drawn by Nature herself, that would have taken you hours to sketch...""