Aldehyde · Ingredient identity
Formaldehyde
Formaldehyde is a named chemical. Formalin describes a solution containing it, so a percentage of formalin and a percentage of formaldehyde may be on different bases.
Look for: CAS 50-00-0 · formaldehyde in water · formalin (solution name)
Use the record
Read the exact ingredient line
Where it appears
NT Labs names formaldehyde in Aquarium Anti-Parasite. Hikari gives upper limits for formaldehyde in its separate aquarium and pond ingredient lists.
What cannot be inferred
An upper bound cannot give an exact lot concentration. A commercial formalin mixture can contain other ingredients, so the solution name alone is incomplete.
What to capture
Keep the printed chemical name, the inequality sign or units and the exact formulation. When the label says formalin, write whether the strength refers to solution or chemical.
Formulation references
Read the original
Sources and date
Sources consulted . A source date does not establish that every market, pack or revision uses the same wording.