4hydroxybenzoic acid
chemical
chemistry
close up
closeup
colorful
crystal
detail
exploration
full frame
light
macro
magnification
methyl ester
methyl paraben
methylparaben
microcrystal
micrograph
micrography
microscopic
microscopy
naoh
paraben
polarised
polarized
polarized light
refraction
research
scholarship
science
thin
translucent