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ASTM E1968-11

Historical Revision

Standard Practice for Microcrystal Testing in Forensic Analysis for Cocaine

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1.1 This guide describes some standard procedures applicable to the analysis of cocaine using multiple microcrystal tests (1-5).

1.2 These procedures are applicable to cocaine, which is present in solid dosage form or an injectable liquid form. They are not typically applicable to the analysis of cocaine in biological samples.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard cannot replace knowledge, skill, or ability acquired through appropriate education, training, and experience and should be used in conjunction with sound professional judgment.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


This technique produces a chemical-precipitation reaction between cocaine and the precipitating reagent. The habit and the aggregation of the crystals formed may be used to distinguish cocaine from other drugs (6).

This technique can be utilized on cocaine present in either the salt or free base form.

This technique does not distinguish between the salt and free base forms.

SDO ASTM: ASTM International
Document Number E1968
Publication Date March 1, 2011
Language en - English
Page Count 3
Revision Level 11
Supercedes
Committee E30.01
Publish Date Document Id Type View
Nov. 15, 2019 E1968-19 Revision
March 1, 2011 E1968-11 Revision
Oct. 10, 1998 E1968-98 Revision
Nov. 10, 1998 E1968-98R03 Reaffirmation