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Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

Colloids and Suspensions

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Related Experiment Video

Updated: Feb 1, 2026

Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Conjunctival Colloid Milium.

Mona Bhargava¹, Saket Benurwar², S Krishnakumar³

¹Department of Cornea and Refractive Surgery, Sankara Nethralaya, Kolkata, India.

|December 1, 2018

Summary

This summary is machine-generated.

This case report details a rare instance of conjunctival colloid milium in an adult, emphasizing its distinction from more serious conditions through histopathology.

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Area of Science:

Ophthalmology
Dermatology
Pathology

Background:

Colloid milium is a rare deposition disease affecting the skin.
Conjunctival involvement is exceptionally uncommon.

Observation:

A 45-year-old woman presented with a slow-growing, painless mass in the medial canthal region extending to the inferior fornix and bulbar conjunctiva.
The lesion was associated with redness and underwent excisional biopsy with amniotic membrane transplantation.

Findings:

Histopathology revealed homogenous amorphous eosinophilic material consistent with nodular colloid milium.
Key diagnostic exclusions included solar damage, amyloidosis (negative Congo red stain), lipoid proteinosis, plasmacytoma, and conjunctival lymphoma.

Implications:

This case highlights the importance of accurate histopathological diagnosis for conjunctival colloid milium.
Distinguishing this rare condition from other periocular masses with similar clinical appearances is crucial for appropriate management and prognosis.