Chrysalis; Is it just basically unformed liquid inside?
This is what we often hear; that the inside is just mush or goo. So what is in there? When does it get there?
Although a squished chrysalis seems to be simply goo, adult butterfly parts were already forming when the caterpillar was still a caterpillar. The green liquid or fluid inside a pupa or chrysalis is butterfly blood (a cocoon is the covering of some species of moth's pupa).
Photos taken under black light (and other lights) of large swallowtail butterfly caterpillar's wing pads show that the shape has sufficiently formed to be able to tell the species of butterfly by the wing pad's shape. A wing pad in a large larva is basically an oval shaped 'gel' looking pad.
Bottom side of a pupating caterpillar/chrysalis Eastern Black Swallowtail
Closer view with antenna and proboscis click photos to enlarge
Side view with wing pads showing
A Monarch pupa is smooth What is inside?
After it pupates and before it totally changes shape you can see some of what is inside
Monarch pupa changing shape in the first hour after pupating antennae and parts still visible