[pure-silver] Re: Hydroquinone
- From: "Gene Johnson" <genej2@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 30 Dec 2004 15:56:23 -0800
Richard,
The warning note on the E-72 recipe was not mine but was there already when
I found the recipe. I'm sorry I do not remember where I found it. The note
about how to make it with the Gainer's stock solution is mine.
Interesting.
Gene
----- Original Message -----
From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, December 30, 2004 3:37 PM
Subject: [pure-silver] Hydroquinone
> I got curious just what hazards Hydroquinone poses. The
> following is from various sources as given.
>
> Mallenkrodt-Baker MSDS:
>
> Potential Health Effects
> ----------------------------------
>
> Inhalation:
> Causes irritation to the respiratory tract. Symptoms may
> include coughing, shortness of breath. Systemic effects have
> not been proven by this route.
> Ingestion:
> Highly Toxic. May cause hyperactivity, stupor, fall in blood
> pressure, hyperpnea, abdominal pain, diarrhea, intense
> thirst, sweating, tinnitis, nausea, dizziness, a sensation
> of suffocation, an increased rate of respiration, vomiting,
> pallor, muscular twitching, headache, cyanosis, delirium,
> and collapse (from respiratory failure). Estimated lethal
> dose lies between 5 to 12 grams (usually because of
> respiratory failure from methemoglobin formation which
> leaves the blood unable to carry oxygen). May cause green to
> brownish-green urine.
> Skin Contact:
> Causes severe irritation, redness and pain. Alkaline
> solutions can cause skin sensitization.
> Eye Contact:
> Causes severe irritation and possible corneal ulceration.
> Chronic Exposure:
> Repeated exposure to vapor or dust (typically 10 to 30
> mg/m3) for > 5 years has caused brownish staining of the
> conjunctiva which may be followed by changes to the cornea
> leading to loss of visual acuity. Repeated exposure may also
> cause skin effects.
> Aggravation of Pre-existing Conditions:
> Persons with pre-existing skin or eye disorders or impaired
> respiratory function may be more susceptible to the effects
> of this substance.
>
> From another M-B MSDS:
> 11. Toxicological Information
>
> Oral rat LD50: 320 mg/kg; investigated as a tumorigen,
> mutagen, reproductive effector.
>
> --------\Cancer
> Lists\------------------------------------------------------
> ---NTP
> Carcinogen---
> Ingredient Known
> Anticipated IARC Category
> ------------------------------------ ----- -----------
> -------------
> Hydroquinone (123-31-9) No No
> 3
> From Fisher Scientific MSDS:
>
>
>
> EMERGENCY OVERVIEW
> Appearance: colorless, light tan, or light gray crystals.
> Warning! Harmful if swallowed. May cause allergic skin
> reaction. This substance has caused adverse reproductive and
> fetal effects in animals. May cause cancer based on animal
> studies. May cause digestive tract irritation with nausea,
> vomiting, and diarrhea. Light sensitive. Air sensitive.
> Causes eye and skin irritation. May cause respiratory tract
> irritation. May cause dermatitis. May cause
> methemoglobinemia.
> Target Organs: Central nervous system, respiratory system.
>
>
> Potential Health Effects
> Eye: May cause eye irritation. Repeated exposure may cause
> corneal abnormalities including structural changes and
> brownish discoloration which can lead to decreased visual
> acuity and blindness.
> Skin: Causes severe skin irritation. May cause skin
> sensitization, an allergic reaction, which becomes evident
> upon re-exposure to this material. May cause dermatitis.
> Repeated exposure may cause hyperpigmentation of fair skin
> and depigmentation of dark skin.
> Ingestion: May cause severe irritation of the digestive
> tract. May be harmful if swallowed. May cause dizziness,
> nausea, sense of suffocation, increased respiratory rate,
> vomiting, pallor, muscle twitching, cyanosis (bluish
> discoloration of skin due to deficient oxygenation of the
> blood), delirium, collapse. May cause green or brownish
> green urine which continues to darken upon standing.
> Inhalation: May cause respiratory tract irritation. Causes
> narcotic effects including headache, dizziness, weakness,
> unconsciousness, and possible death. Vapors may cause
> dizziness or suffocation. Inhalation of dust may cause
> respiratory tract irritation. Exposure to high concentration
> of vapor may caues irritation, photophobia, tearing, and
> corneal ulceration.
> Chronic: Prolonged or repeated skin contact may cause
> sensitization dermatitis and possible destruction and/or
> ulceration.
>
> And:
>
>
>
> Section 12 - Ecological Information
>
>
>
>
> Ecotoxicity: Fish: Rainbow trout: LC50 = 0.097 mg/L; 96 Hr.;
> UnspecifiedFish: Fathead Minnow: LC50 = 0.1-0.18 mg/L; 96
> Hr.; UnspecifiedBacteria: Phytobacterium phosphoreum: EC50
> =0.77-3.97 mg/L; 5,15,30 minutes; Microtox test No data
> available.
> Environmental: Substance has a high biological oxygen
> demand, and a high potential to affect aquatic organisms.
> Substance readily biodegrades, and is not likely to
> bioconcentrate.
> Physical: No information available.
> Other: None.
>
> And:
>
> Epidemiology: Substance may be involved in cancer-forming
> processes.
>
> From Eastman Kodak MSDS:
>
> ===================== Ecological Information
> =====================
>
> Ecological:HIGH BIOCHEMICAL OXYGEN DEMAND, A POTENTIAL TO
> CAUSE OXYGEN
> DEPLETION IN AQUEOUS SYSTEMS, A HIGH POTENTIAL TO AFFECT
> SOME
> AQUATIC ORGANISMS, A MODERATE POTENTIAL TO AFFECT
> SECONDARY WASTE
> TREATMENT MI CROBIAL METABOLISM, A MODERATE POTENTIALTO
> AFFECT
> GERMINATION OF SOME PLANTS, A MODERATE POTENTIAL TO
> AFFECT GROWTH
> OF SOME PLANT, A HIGH POTENTIAL TO BIODEGRADE, A HIGH
> POTENTIAL TO
> PHOTOCHEMICALLY O R CHEMICALLY DEGRADE, A LOW POTENTIAL
> TO
> BIOCONCENTRATE. AFTER DILUTION WITH A LARGE AMOUNT OF
> WATER,
> FOLLOWED BY SECONDARY WASTE TREATMENT, THIS MATERIAL IS
> NOT
> EXPECTED TO CAUSE ADVERSE ENVIRONMENT AL EFFECTS.
>
> Some MSDS indicate that Hydroquinone is _suspected_ of
> being a contributing carcinogen to some animal cancers. I
> have been unable to find the exact source or the relation
> this has to human carcinogenicity. I suspect the hazard is
> small. Remember that MSDS are meant to cover users of very
> large quantities of a substance. They are also _legal_ not
> _scientific_ docments meant to protect the issuer from legal
> jeapordy. They must be interpreted with this in mind.
>
> Hydroquinone sould be handled with care. The
> protections recommended are similar to those for other
> substances which pose hazards in airborne condition. Wear a
> dust mask, a face protector or goggles, wear gloves, wear
> protective clothing. Work in a well ventillated place. Work
> in a way that minimises the chance of the substance becoming
> airborne. In general, minimise contact with the substance.
>
> A saftey booklet about Hydroquinone published by the state
> of New Jersey may be found at:
>
> http://www.state.nj.us/health/eoh/rtkweb/1019.pdf
>
> A report on an extensive research program on the health
> hazards of Hydroquinone may be found at:
>
> http://www.inchem.org/documents/ehc/ehc/ehc157.htm
>
>
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
>
>
>
>
>
>
>
>
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