Hexagon paper for chemistry
A fine hexagonal lattice at writing size, for drawing ring structures with correct 120° bond angles instead of approximating them freehand.
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Ring structures at writing size
Benzene, cyclohexane, pyridine, the pyranose form of glucose — a large part of organic chemistry is hexagons with 120° bond angles. Drawn freehand they come out lopsided, and once a ring is lopsided the substituent positions become ambiguous. On a 5 mm hex grid every ring is regular and every bond is the same length, so ortho, meta and para are unmistakable at a glance.
Fused rings line up for free
Naphthalene, anthracene, steroids and every fused polycyclic system share edges between rings. On a hex lattice the shared edge is already drawn, and the second ring lands correctly with no construction at all. Getting all four rings of a steroid nucleus to fuse cleanly freehand is a real nuisance; on this paper it takes seconds and comes out right every time.
Keep the grid light
The hexagons are scaffolding, not the drawing. Set a light weight and a pale grey so that the bonds you actually ink stand clear of the lattice underneath. If the sheet is going to be scanned or photocopied for a problem set, go lighter still — copiers tend to drop faint greys altogether, which here is precisely the behaviour you want.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100% — not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.