WHITENESS OF EXTENDER

This a test covers the methods to compare the whitness of an extender against approved and previously stored master sample. This is a quick and easy method to approve or reject the supplies based on its colour immediately on receipt.

APPARATUS AND REAGENTS :

1. 4" x 4" clean glass plate.

2. Spatula.

3. Mineral turpentine

4. Previously approved master sample.

PROCEDURE :

Place asmall amount of the extender sample on the glass plate. Carfully flatten the sample using a spatula. Now keep the master sample near the test sample. Flatten the master sample. Do it carfully so that the samples inspite of being close do not mix up or touch each other. Carefully wet both samples adding mineral turpentine drop by drop and observe the colour of sample from the back of plate mineral turpentine helps to hold the powder on the glass plate. Observe the colour of both samples and report.

note to report the difference in tone between sample and master as comparable, cleaner, yelloer, reddish etc.