Seal Paste
There are two types of seal paste depending on what base material they are made of.
- Silk: The red paste is made from finely pulverized cinnabar, mixed with castor oil and silk strands. The silk strands bind the mixture together to form a very thick substance. It has a very oily appearance and tends to be a bright red in colour.
- Plant: The red paste is made from finely pulverized cinnabar, mixed with castor oil and moxa punk. Because the base is a plant one that has been pulverised, the texture is very loose due to the fact that it does not bind. The appearance is sponge like and not oily and tends to be a darker shade of red.
Plant-based paste tends to dry more quickly than silk-based pastes because the plant extract does not hold onto the oil as tightly as silk. Depending on the paper used, plant pastes can dry in 10 to 15 minutes. The more absorbent the paper is, the faster it dries as the paper absorbs most of the oil. Also, plant pastes tend to smudge more easily than silk pastes due to the loose binding agent.
The paste is kept covered after it has been used, in its original container (be it plastic or ceramic). It is kept in an environment away from direct sunlight and away from intense heat to prevent it from drying out.
When the seal is pressed onto the printing surface, the procedure differs according to plant or silk based paste. For silk based paste, the user applies pressure, often with a specially made soft, flat surface beneath the paper, and rocks it forward and back, left and right slightly. For plant based paste, the user simply applies light pressure. As lifting the seal vertically away from its imprint may rip or damage paper, the seal is usually lifted off one side at a time, as if bent off from the page. After this, the image may be blotted with a piece of paper to make it dry faster, although this may smudge it.
Read more about this topic: Seal (East Asia)
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