Overview
Many staining problems are avoidable with attention to preparation and technique. Recognising common pitfalls saves time and produces trustworthy results.
High Background
Caused by insufficient blocking, excess antibody, or over-development. Improve blocking, titrate antibody and optimise development time.
Patchy or Uneven Staining
Often from folds, air bubbles or inconsistent reagent coverage. Keep sections flat, avoid bubbles, and ensure even incubation.
Faint or No Signal
Usually from under-fixation, antigen masking or an unsuitable antibody. Verify fixation, add antigen retrieval, and check antibody specificity.
Non-Specific Staining
Weak specificity of antibody or cross-reactivity. Use validated antibodies and include negative controls to confirm specificity.
Section Damage
Torn, folded or detached sections point to cutting or handling issues. Improve sectioning and use coated slides for fragile sections.
Best Practice
Run controls, document conditions, and standardise the whole workflow — prevention is far easier than troubleshooting.