What makes a beauty review useful
You should be able to disagree with it
A review is useful when you can reconstruct the reasoning and decide it was wrong. Most reviews make that impossible.
Updated 8 min read
How to compare beauty products fairly
Two products, one face, one day
A comparison is only a comparison if one variable changed. Two foundations tested on different days, in different weather, over different skincare, applied with different tools, are not being compared. They are being described in sequence and then ranked, which is a different and much less useful thing.
The split-face test and its limits
The best available method, and the three ways it still misleads you.
Hold the base layer constant
Skincare underneath is the most commonly ignored variable in complexion comparison.
Same tool, same quantity, same day
Application differences produce bigger swings than formula differences.
Price is a fifth variable, not a tiebreaker
How to fold cost in without letting it decide the result before testing starts.
Writing a comparison that survives disagreement
Publish the protocol alongside the result so a reader can weigh the finding themselves.
The stage this explains Comparison