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title: Leneta TK-21 paper test ink with low penetration for uncoated paper | Novamart AG
url: https://novamart.ch/en/product/leneta-tk-21-paper-test-ink-with-low-penetration-for-uncoated-paper/
language: en-GB
---

# Leneta TK-21 paper test ink with low penetration for uncoated paper | Novamart AG

> For the assessment of mottling, absorption resistance and porosity of uncoated paper.

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# Leneta TK-21 paper test ink with low penetration for uncoated paper

[Product overview](https://novamart.ch/en/product-catalogue-3/) / [Laboratory & Inspection](https://novamart.ch/en/product-category/laboratory_inspection/) / [Calibration & Standards](https://novamart.ch/en/product-category/laboratory_inspection/calibration-standards/) / Leneta TK-21 paper test ink with low penetration for uncoated paper

## Leneta TK-21 paper test ink with low penetration for uncoated paper

For the assessment of mottling, absorption resistance and porosity of uncoated paper.

SKU: Leneta TK-21Categories: [Water absorption/absorption - Penetration](https://novamart.ch/en/product-category/measuring-instruments/_material_surface_layers/water-absorption-penetration/) , [Calibration & Standards](https://novamart.ch/en/product-category/laboratory_inspection/calibration-standards/) , [Charts, maps & sample sheets](https://novamart.ch/en/product-category/charts-maps-sample-sheets/)

## Required accessories relevant ...

- [Paper test ink film applicator TK-100](https://novamart.ch/en/product/leneta-tk-100-applicator-for-paper-test-ink/)

- Description
- Technical
- Additional information

Article TK-21 Leneta paper test ink with low penetration depth for uncoated paper to assess mottling, absorption resistance and porosity

This test ink provides a quick and easy way to monitor variations in paper structure and porosity from batch to batch. Uncoated paper with low holdout requires a low penetration ink, such as TK-21, to avoid excessive colour that would mask any mottle or holdout differences.

### Specifications

- Packaging: 118 ml (227 g - 0.5 lb) per container
- Containers per crate: 8
- Minimum order: 1 container

### Test procedure

The ink is applied to the paper to be tested using a spatula or a drawdown applicator. After one minute, the ink is removed by scraping off most of the ink with a ruler and carefully wiping off the rest with a clean paper towel. The resulting test sample is visually inspected for stains and porosity. To obtain an instrumental value for porosity, the CIE-Y reflectance or densitometer values of the coloured and uncoloured areas are measured and then calculated:

| TK-11 High Penetration lnk | TK-21 Low Penetration Ink | | TK-11 High Penetration Ink | TK-21 Low Penetration Ink |
| --- | --- | --- | --- | --- |
| | | | |
| Coated papers | Uncoated papers |

## Additional information

| brand | Leneta |
| --- | --- |
| Mission | Absorptionswiderstand, Fleckenbeständigkeit & Porosität, Lackprüfung, Porosität |
| Industry sectors | !!! Painters Coaters Printers |
| Substrates/substances | Coatings and printing inks |

## Optional ...

- [Leneta TK-11 paper test ink with high penetration for coated paper](https://novamart.ch/en/product/leneta-tk-11-paper-test-ink-with-high-penetration-for-coated-paper/)
- [TQC Sheen permeability cup](https://novamart.ch/en/product/tqc-sheen-permeability-cups/)

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