one method of pre-treatment involves lightly damaging the seed coat to allow water uptake necessary for germination. Usually heat or abrasion (rubbing the seed coat with sandpaper) are used - e.g. with Acacia seeds. Pre-treatment for seeds of some plants involves chilling seeds (cold, moist stratification).
The chemical alteration of a surface to make it suitable for application of paint or powder. The process usually includes cleaning and applying a conversion coating.
A process prior to painting in which the steel or aluminium substrate is cleaned and treated with a solution (usually) of corrosion inhibiting chemicals such as acid phosphates or chromate's. Can also be used to describe flame or electrical treatment of plastic prior to coating.