TLC recipes

KMnO4
KMnO4 (3g)
K2CO3 (20g)
5% NaOH(aq) (5ml)
water (300ml)

Allow it a while to dissolve/homogenise fully.

Ninhydrin
Ninhydrin (0.2g)
Acetic acid (0.5ml)
water (4.5ml)
n-Butanol (100ml)

This acetic acid / n-butanol recipe helps add sensitivity for secondary amines, and Boc / Cbz protected secondary amines (the protecting groups fall off on heating).

Anisaldehyde
p-Anisaldehyde (1ml)
Acetic acid (10ml)
cH2SO4 (5ml)
EtOH (85ml)

Seebach's "magic" stain
Phosphomolybdic acid (2.5g)
Ce(SO4)2 (1g)
cH2SO4 (6ml)
water (94ml)

"Magic" in that this stain can apparently visualise almost anything.

TLC recipes at orgprepdaily
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