Yes, you can. Use workable fixative or retouch varnish.
A big pooh
Fixatives are classified as coagulative fixatives and cross-linking fixatives. Carnoy's fixative is a coagulative fixative. Coagulative fixatives change the shape or structure of protein molecules without binding to them, while cross-linking fixatives bind chemically to protein molecules at one or more points. In cross-linking fixatives molecules are linked together to form an insoluble latticework by forming chemical bridges between protein chains. Carnoy's fixative is a coagulative fixative.
30:1
please explain the answer
Picric acid is a fixative (for example is found in Bouin's) but can be found in picrosirius red (is required for the sirius red stain to selectively bind collagen).
methyl alcohol
it is a hair spray for hard-to hold hair.
Carnoy's solution is a fixative creating covalent chemical bonds between proteins in tissue. Most commonly used fixative in histology is formaldehyde. It prevents decay.
Expoxy resin is very stable and that is exactly what you need in a goo fixative. The last thing you need is an unstable mix of chemicals,that can end in disaster. The advantages of epoxy resin as a fixative are that it is durable, long-lasting, and inexpensive. Epoxy resin also resists cracking, unlike many older adhesives.
it should be stable and should be volatile in nature.
Charcoal drawing can be made more permanent using a spray fixative. Most craft stores carry one or more brand-name of fixative. I recommend you try a test, using the spray on an unimportant scrap of paper with charcoal on it, as sometimes there is a change in colouration when using fixative and it is best to know what to expect.