Why are Pigment Spots Different Sizes?

[LadiesMan]

1. Why are some pigment spots larger (area and volume) than others?


I understand that pigments move up the porous paper by capillary action, from research. But why are some pigment colours (areas) larger? THanks

 

[LtStorm]

I'd think the area being larger would mostly imply more of the pigment was placed on the paper. I imagine a very small volume of difference between drops of two pigments would cause a still noticeable difference in the size of the spots.

 

[Blueshift5]

There are a few factors that can contribute to the size of pigment spots. One of the main factors is the concentration of pigment in the solution being used. If the solution has a higher concentration of pigment, the spots will appear larger. Additionally, the type of pigment being used can also play a role. Some pigments have larger molecules and therefore create larger spots. The amount of time the solution is allowed to move up the paper can also impact the size of the spots. If the solution is left to move for a longer period of time, the spots may become larger. Lastly, the absorbent properties of the paper can also affect the size of the spots. If the paper has a higher absorbency, the spots may spread out more, resulting in a larger size. Overall, the size of pigment spots can vary based on a combination of these factors and may require further experimentation and analysis to fully understand.