When the mixture boils, turn the heat down to a simmer.

Then, bring to a boil and cook over medium-high heat until the mixture turns to dark caramel.

Cook over medium-to-high heat for about 5 minutes, until the mixture turns a light caramel color.

Stir occasionally until mixture turns golden brown (which it may do rather suddenly).

That mixture turns the plankton into itself, seems like.

Stir in sugar, and continue to cook, stirring, until mixture turns amber.

Boil until the liquid is almost gone and the mixture turns syrupy, 15 to 20 minutes.

Cook over a gentle heat, stirring until the mixture turns thick.

After 10 seconds, the colorless mixture suddenly turns blue.

After much stirring, the mixture turns to the consistency of a thin pudding.