Laboratory Reagents,Basic Fuschsin,Bromo Cresol Purple,Bromo Phenol Blue

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Menthol Crystal and Peppermint

Laboratory Reagents

Basic Fuschsin

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Specification Sheet

CAS NO.	632 - 99 - 5
C.I. NO.	42510
Chemical Formula	C₂₀H₂₀ClN₃
Molecular Weight	337.86
Dye Content	~88%
Absorption Max	549 - 552 nm
Absorptivity (1%, 1cm)	2350 - 2700
Loss On Drying	<10%

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Bromo Cresol Purple

Specification Sheet

CAS No.	115 - 40 - 2
Chemical Formula	C₂₁H₁₆Br₂O₅S
Molecular Weight	540.24
Melting Point	240º c
Dye Content	~95%
Transition Range	pH 5.2 - 6.8 Greenish Yellow to Purple
Absorption Max (pH 5.2)	427 - 431 nm
Absorption Max (pH 6.8)	588 - 590 nm
Absorptivity (1%,1cm) pH 5.2	400 - 450
Absorptivity (1%,1cm) pH 6.8	1000 - 1100
Loss On Drying	<1%

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Bromo Phenol Blue

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Specification Sheet

CAS No.	115 - 39 - 9
Chemical Formula	C₁₉H₁₀Br₄O₅S
Molecular Weight	669.98
Melting Point	272 - 273º c
Dye Content	~95%
Transition Range	pH 3.0 - 4.6 Greenish Yellow - Reddish Blue
Absorption Max (pH3.0)	434 -439 nm
Absorption Max (pH4.6)	590 - 593 nm
Absorption (1%,1cm) pH 3.0	350 - 385
Absorption (1%,1cm) pH 4.6	940 - 1000
Loss On Drying (110º c)	<1%

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Bromo Thymol Blue

Specification Sheet

CAS No.	76 - 59 - 5
Chemical Formula	C₂₇H₂₈Br₂O₅S
Molecular Weight	624.40
Melting Point	200 - 202º c
Dye Content	~95%
Transition Range	pH 5.8 - 7.6 Yellow - Blue
Absorption Max (pH 5.8)	430 - 435 nm
Absorption Max (pH 7.6)	615 - 618 nm
Absorptivity (1%,1cm) pH 5.8	260 - 300
Absorptivity (1%,1cm) pH 7.6	470 - 520
Loss On Drying (110º c)	< 3%

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o-Cresalphthalein

Specification Sheet

CAS No.	596 - 27 - 0
Chemical Formula	C₂₂H₁₈O₄
Molecular Weight	346.38
Dye Content	~95%
Absorption Max pH 9.8	592 - 596 nm
Solution Clarity (Ethanol)	To pass
Transition Range	pH 8.2 - 9.8 Colourless - Red
Absorptivity (1%,1cm) pH 9.8	900 - 1000
Loss On Drying (110º c)	< 1%

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Cresol Red

Specification Sheet

CAS No.	1733 - 12 - 16
Chemical Formula	C₂₁H₁₈O₅S
Molecular Weight	382.43
Melting Point	290º c
Dye Content	~95%
Transition Range	pH 0.5 - 1.8 Pink to Yellow pH 7.2 - 8.8 Yellow - Purple
Absorption Max (pH 0.5)517-520 nm	1180 - 1230
Absorption Max (pH 2.5)432-436 nm	490 - 540
Absorption Max (pH 2.5)432-436 nm	490 - 540
Absorption Max (pH 2.5)571-574 nm	1000 - 1050
Loss On Drying (110º c)	< 5%

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Eosin Yellowish

Specification Sheet

CAS NO.	17372-87-1
C.I. NO.	45380
Chemical Formula	C₂₀H₆Br₄Na₂O₅
Molecular Weight	691.88
Melting Point	> 300º c
Dye Content	~88%
Absorption Max	515 nm - 518 nm
Absorptivity (1%, 1cm)	1200 - 1400
Loss On Drying (110º c)	< 8%

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Methyl Orange

Specification Sheet

CAS No.	547-58-0
C.I. No.	13025
Chemical Formula	C₁₄H₁₄N₃NaO₃S
Molecular Weight	327.34
Melting Point	300º c
Dye Content	~95%
Transition Range	pH 3.0 - 4.4 Pink-Orange yellow
Absorption (pH 3.0)501-504nm	1050-1150
Absorption (pH 4.4)467-471nm	750-850
Loss On Drying (110º c)	< 5%

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