Dye · Ingredient identity
Methylene blue
Methylene blue appears in single-ingredient labels and in blends. The blue color does not identify the exact product or amount.
Look for: methylthioninium chloride · Methylthioniniumchlorid
Use the record
Read the exact ingredient line
Where it appears
NT Labs lists it on its Aquarium Methylene Blue page and as one of two actives in Disease Solve. The German sera Baktopur page names methylthioninium chloride.
What cannot be inferred
An amount printed for a bottle does not measure aquarium concentration. A compatibility statement about another dye or another manufacturer’s formulation cannot be transferred.
What to capture
Copy the label’s salt name and units. Record whether the document describes a bath, aquarium use, or a separate use context.
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.