Simple staining is among the traditional staining techniques. Indigenous the name, it is rather clear that it is a very simple or direct staining method that provides a single stain only. The microorganisms space invisible come the naked eye, and also to make them visible, staining is carry out that offers divergence to a microscopic image. Straight staining provides the use of basic dyes favor methylene blue, safranin, crystal violet, malachite eco-friendly etc. Referred to as “simple or direct stains”.

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The an easy stains possess a positive auxochrome the charges the stain’s chromogen particles to bind v the specimen. The chromophore group of the stain imparts colour to the microscopic image. As the straightforward stain carries a hopeful charge, the is likewise called positive or cationic stain. The function of straight staining is to add contrast come the specimen by directly stain the bacterial cells v a colourless background.

The simple stains do the organism clearly shows and assist us research the organism’s shape, size, and arrangement, essential to identify a details group of organisms. The process generally requires three sequential steps prefer smear preparation, heat fixing and also staining of the bacteria.

Content: an easy Staining

Procedure of an easy Staining

Definition of basic Staining

Simple staining is characterized as among the ordinaries yet the popular technique used come elucidate the bacter size, shape and arrangement to identify the various bacteria groups. That stains the bacterial cell uniformly and thus boosts the visibility of one organism. The term simple staining periodically interchangeable v the terms favor direct, confident or monochrome staining. Currently let us recognize why basic staining is called by such alternative names.

Direct staining: since it is a direct technique that directly stains the bacterial cell v a colourless background.Positive staining: because it provides positively charged simple dyes the bind through the negatively fee bacterial cell.Monochrome staining: since it adds contrast to the specimen by utilizing a solitary stain only.

Simple Stains

Simple stains deserve to be characterized as the basic dyes, which space the alcohol addict or aqueous remedies (diluted approximately 1-2%). These can conveniently release OH– and accepts H+ ion, because of which the straightforward stains are positively charged. Together the an easy stains are positively charged, they commonly termed as confident or cationic dyes.

It is commonly used to colour most bacteria. Together the an easy stain carry a optimistic charge, it firmly adheres to a an adverse bacterial cell and also makes the organism coloured by leave a elevator colourless. Examples of an easy stains include safranin, methylene blue, crystal violet etc.

The an easy stains have different exposure times to penetrate and stain the bacterial cell.Basic stainsExposure time come stain the bacteria
Methylene blue1-2 minutes
Crystal violet20-60 seconds
Carbol fuschin15-30 seconds
Safranin30-60 seconds


Its rule is based on producing a marked contrast in between the organism and its surroundings by using basic stain. A simple dye is composed of a positive chromophore, i m sorry strongly attracts the negative cell components and charged molecules prefer nucleic acids and also proteins. Thus, a straightforward staining an approach results in a coloured bacter cell against a colourless background.


Procedure of an easy Staining

It involves the adhering to three steps:

Smear preparationHeat fixingStaining


Smear Preparation

A bacter smear appears as a thin film of bacterial culture. For the smear preparation, we must perform the complying with steps:

Take a clean, grease-free glass slide.Add a drop of distilled water come the center of the glass slide.Then, add inoculum indigenous the bacterial society with a sterilized inoculating loop top top the glass slide.After that, mix the inoculum v a fall of distilled water to do a slim film by uniformly rotating the inoculating loop until a thin bacterial film is formed.


Heat Fixing

After smear preparation, move the ready slides over the Bunsen burner’s flame at the very least three times. Then, allow the on slide to wait dry. Over there are countless reasons to perform heat fixing, and it have the right to not it is in skipped because:

Heat addressing helps in the permanent of a specimen to the glass slide.Heat addressing helps the stain to permeate the smear.


Staining of Bacteria

It is the last and the most an essential step, in i beg your pardon one have the right to identify the morphological qualities of the bacteria through microscopic examination, as soon as the cells get stained. This stage entails the adhering to steps, which room as follows:

Add stain to the warm fixed smear.Allow the stain to was standing for at least 1 minute so that it deserve to penetrate between the cells.Wash off the glass on slide carefully.Blot dry the slide through absorbent file (do no wipe the slide).Examine the glass slide under the microscope from low to high strength to obtain a magnified view the the specimen. One can also add a drop of oil immersion end the glass slide’s stained area to observe it under 100X objective.



AdvantagesSimple staining is a really simple an approach to perform, which stains the biology by using a single reagent.It is a rapid technique that reduces the power time by taking just 3-5 minutes.Simple staining help to research or elucidate the bacter shape, size and also arrangement.It additionally helps united state to differentiate the bacterial cells from the non-living structures.Simple staining have the right to be advantageous in the preliminary study that the bacteria’s morphological characteristics.

DisadvantagesIt go not provide much information about the cell apart from the bacteria’s morphological characteristics.Through straightforward staining, us cannot share a particular kind of organism.


Therefore, we deserve to conclude that a basic staining method is the easiest method to color the microscope object as it provides a single straightforward stain. The results of basic staining are based on the form of an easy stain that has actually been used.

The colour of a stain will certainly decide the colour of a specimen that has to be identified. Because that example, once the bacteria maintain the safranin colour, they appear pink-red, and the very same goes through the other stains.

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There is an attraction in between the hopeful stain and the an unfavorable bacterial cell in simple staining, which results in the observation of coloured bacteria through a shining background.