Abstract: A method of calibrating a computer-controlled printing machine to produce printed copies of an original image to a pre-determined standard, comprises: using the printing machine to print a reproduction of a step wedge, having patches with densities concentrated in a central region of the density range, with the machine set to dot gain values corresponding to pre-determined density values on a standard dot gain profile; formulating a revised dot gain profile having the same shape as the standard dot gain profile but with a maximum dot gain which is equal to the maximum measured dot gain and which is located at the density having the maximum measured dot gain; determining revised dot gain values for the predetermined density values from the revised dot gain profile; and setting the dot gain values in the printing machine in accordance with the revised dot gain values.

Abstract: An extension indicator is provided for determining a predetermined extension applied to an extensibly deformable article such as medical bandage used in compression therapy. The indicator includes first (420) and second (430) co-operating members, each adapted to be secured to an extensibly deformable article (440). One of the members is more extensible than the other and each member (420, 430) bears visual indicia (450, 460, 470) which upon extension of the more extensible member, are adapted to align with each other to indicate a predetermined extension of the more extensible member.

Abstract: A container is provided for carbonated beverages such as beer, sparkling wines and soft drinks. The container can be made entirely of plant-based material such as card. In other forms of the invention additional layers of, for example, plastic or non-woven material may be provided. The container is therefore easy to dispose of.