In the operant conditioning paradigm, extinction refers to the process of no longer providing the reinforcement that has been maintaining a behavior. Operant extinction differs from forgetting in that the latter refers to a decrease in the strength of a behavior over time when it has not been emitted.
Gel medium is an acrylic product. It comes in Heavy, Soft, and Regular and has a variety of finishes, Matte, Gloss and Semi-gloss. The basic use for these is to build texture in paintings by mixing them with acrylic paint. If you add a small bit of it to your paint it will also extend the drying time. The Soft gel is the medium that is most often used by paper artists. It can be used as a glue for collage and it is also used to make photocopy transfers.
Ballpoint ink is not the easiest of mediums to use, but it is fun to experiment with. Gel pens are particularly prone to get dry very quickly. Snip the dry reservoirs and put them in a container, as above, but this time dilute with water. I like the ink made with gel pens because it very often has a shiny, glittery texture. Here is a flamingo I painted using ink made out of a few pink and orange dry gel pens. Gel pen ink is also easier to use, as it can be further diluted with water. I spent the Christmas holidays going for walks in various parks and gathered a few things that I could turn into art tools, like bamboo stems and a pigeon feather (hoping the ex owner didnât have the flu!)