Is Blackish copper tube can be useable?

10 November 2022 0 6K Report

The copper condenser is stored in dry air conditioning. After 7 months the copper condenser turns into blackish color on the tube surface.

2. Under the foil tape the tube could not /be observed blackish color.

My question is can we use this blackish color?

3. If we rub with hand , the blackish color will go away.

Below given I some pictures of blackish color tubes.

Badges
Science topic

Similar topics
Phytochemistry
Extracts

More Atik Islam's questions See All

Has anyone applied Python in the field of textile engineering for data analysis, automation, or smart textiles?

I'm currently exploring the application of Python in textile engineering, specifically in areas like data analysis, process automation, and the development of smart textiles. I'm interested in...

10 August 2024 7,429 2 View

How to use ERP System in Global University ?

27 July 2024 8,229 0 View

How can I prepare the csv. dataset to find the flood triggaring factor using ANN?

here's a concise guide for preparing your CSV dataset in Excel to identify flood-triggering factors using an ANN: Clean and Format:Address missing values (fill with mean/median or remove if...

21 June 2024 7,941 0 View

How do integrate ECG, PCG, and clinical data to apply early fusion multimodal?

how do integrate ECG, PCG, and clinical data to apply early fusion multimodal?

10 June 2024 3,289 1 View

How can I make complex file of ligand (including flexible residues from protein) with protein Structure after AutodockFR docking?

I have performed the Molecular Docking using ADFR suite, I have obtained the files in _out.pdbqt format for ligand docked poses, upon inspection, both visually and reading the pdbqt files of...

08 June 2024 8,130 2 View

Could anyone suggest me which filter paper would be best for filtration process?

Dear Respected Scholars, I am working on detection of microplastic in prawn. Although, all the other parameters assessed smoothly but I have encounterd a problem during isolation of microplastics...

05 June 2024 2,469 0 View

How can I select the exact value in Flow Accumulation to identify the streams during Basin delineation?

In basin delineation and hydrological modeling, selecting the exact value in Flow Accumulation to identify streams is a critical step. The Flow Accumulation tool calculates the accumulated flow as...

30 May 2024 6,107 1 View

Are multi-level models appropriate for binary outcome variables for DHS datasets? If yes, what is the process?

30 May 2024 2,035 2 View

How to increase yield and purity of RNA from muscle of EEL using TRIzol??

For my project, I need to extract RNA from muscle tissue of EEL. I am trying but the yield is low and Purity not good. The 260:230 ratio is always below 1.50 and 260:280 ratio ranges 1.6-1.86 and...

15 May 2024 3,024 2 View

Which is better using low DC voltage or high DC voltage for three phase inverter for driving three phase induction motor?

For the design of three phase inverter for three phase motor drive, which is better using low DC voltage (12 V or 24 V DC) for the inverter stage then step it up using three phase transformer, or...

08 May 2024 3,491 3 View

Is skin yellowness an numerical or ordinal variable?

I have a response variable called skin yellowness, which I will measure via a scored color chart, whereby 1 is pale yellow and 15 is orange. I'm not sure if this counts as an ordinal variable,...

11 August 2024 4,793 1 View

What is the difference between mathematical R^4 space and physical 4D unit space?

We assume that the difference is huge and that it is not possible to compare the two spaces. The R^4 mathematical space considers time as an external controller and the space itself is immobile in...

10 August 2024 6,678 14 View

Why do i have a weak plasma and no coating during rf sputtering?

I have been getting a low plasma and no coating while doing rf sputtering of copper doped ZnS using a power of 140 watts and at pressure of 6.5x10-3 Mb.

07 August 2024 4,526 4 View

Why do we equate male and female arousal?

Women, on the other hand, can become physically aroused (increased blood flow in the reproductive organs) without becoming psychologically aroused even in the slightest. (Robert Weiss)

05 August 2024 9,537 2 View

What Are the Best Alternatives to the MTT Assay for Assessing Cell Toxicity of Colored Herbal Extracts?

I am currently investigating the cytotoxicity of a series of herbal extracts, and like many studies, I have been using the MTT assay to evaluate cell viability. However, I am encountering a...

31 July 2024 193 4 View

Why applying a saved template of a bar chart in a different/new one doesn't take effect in SPSS?

Using SPSS, I made my edits in one bar chart — e.g., font type and size, hiding grid lines, and colours, namely: blue, orange, green, purple, and grey for 5 bars, respectively, etc. — and I saved...

29 July 2024 1,981 1 View

Addition of EDTA during the synthesis of copper nanoparticles to prevent it from being oxidized?

I've attempted to use this method to synthesize copper nanoparticles. Copper nanoparticles can be synthesised using a variety of precursor materials. CuSO4, distilled water, NaOH, and EDTA are...

28 July 2024 8,027 3 View

How to estimate sample size for GWAS of continuous and discrete traits? What are the pre-requisites?

Genome-wide association study (GWAS) Continuous traits: eg. Height Discrete traits: eg. Eye color

28 July 2024 286 0 View

Can anyone help me explain my problem?

Hi, Now I am doing a single-base editing by using HiFi Cas 9, guideRNA, single stranded DNA, HDR Enhancer V2 and my tranfection mehtod is lipofection (RNAiMax). Unfortunately, after gene editing,...

26 July 2024 2,136 0 View

Aqua regia not heating up?

I used Aqua regia to clean Au nanoparticles in the used glassware. But for some reasons, it is not heating up upon mixing. The color did change from no color to light orange. The Au NPs on the...

25 July 2024 4,390 0 View